【愚公系列】2022年08月 微信小程序-(rich-text)富文本和(text)文本的详解

文章目录

• 前言
• 一、富文本使用
  • 1.富文本的基本使用
  • 2.富文本中预览图片
    • 2.1 原生使用
    • 2.2 组件封装使用
      • 2.2.1 组件封装
      • 2.2.2 组件使用
• 二、文本
  • 1.文本属性

---

前言

富文本格式（Rich Text Format）即RTF格式，又称多文本格式，是由微软公司开发的跨平台文档格式。大多数的文字处理软件都能读取和保存RTF文档。它是一种方便于不同的设备、系统查看的文本和图形文档格式。

RTF使用美国国内标准协会（ANSI）、 PC-8、 Macintosh（mac苹果），或 IBM 的 PC 字符设置控制显示形式和打印形式。在不同的操作系统下创建的RTF文档可以在多种操作系统和应用程序之间互相传输、查看。其作为 MS-DOS、 Microsoft Windows、 OS/2、 Macintosh苹果系统，应用程序之间处理文档的特殊翻译软件。

微信小程序富文本属性：

属性	类型	默认值	必填	说明	最低版本
nodes	array/string	[]	否	节点列表/HTML String	1.4.0
space	string		否	显示连续空格	2.4.1

nodes子属性

现支持两种节点，通过type来区分，分别是元素节点和文本节点，默认是元素节点，在富文本区域里显示的HTML节点

1、元素节点：type = node

属性	说明	类型	必填	备注
name	标签名	string	是	支持部分受信任的 HTML 节点
attrs	属性	object	否	支持部分受信任的属性，遵循 Pascal 命名法
children	子节点列表	array	否	结构和 nodes 一致

2、文本节点：type = text

属性	说明	类型	必填	备注
text	文本	string	是	支持entities

一、富文本使用

1.富文本的基本使用

代码语言：javascript复制

const htmlSnip =
`<div class="div_class">
  <h1>Title</h1>
  <p class="p">
    Life is&nbsp;<i>like</i>&nbsp;a box of
    <b>&nbsp;chocolates</b>.
  </p>
</div>
`

const nodeSnip =
`Page({
  data: {
    nodes: [{
      name: 'div',
      attrs: {
        class: 'div_class',
        style: 'line-height: 60px; color: red;'
      },
      children: [{
        type: 'text',
        text: 'You never know what you're gonna get.'
      }]
    }]
  }
})
`

Page({
  onShareAppMessage() {
    return {
      title: 'rich-text',
      path: 'page/component/pages/rich-text/rich-text'
    }
  },

  data: {
    htmlSnip,
    nodeSnip,
    renderedByHtml: false,
    renderedByNode: false,
    nodes: [{
      name: 'div',
      attrs: {
        class: 'div_class',
        style: 'line-height: 60px; color: #1AAD19;'
      },
      children: [{
        type: 'text',
        text: 'You never know what you're gonna get.'
      }]
    }]
  },
  renderHtml() {
    this.setData({
      renderedByHtml: true
    })
  },
  renderNode() {
    this.setData({
      renderedByNode: true
    })
  },
  enterCode(e) {
    console.log(e.detail.value)
    this.setData({
      htmlSnip: e.detail.value
    })
  }
})

代码语言：javascript复制

<view class="container">
  <view class="page-body">
    <view class="page-section">
      <view class="page-section-title">通过HTML String渲染</view>
      <view class="page-content">
        <scroll-view scroll-y>{{htmlSnip}}</scroll-view>
        <button style="margin: 30rpx 0" type="primary" bindtap="renderHtml">渲染HTML</button>
        <block wx:if="{{renderedByHtml}}">
          <rich-text nodes="{{htmlSnip}}"></rich-text>
        </block>
      </view>
    </view>

    <view class="page-section">
      <view class="page-section-title">通过节点渲染</view>
      <view class="page-content">
        <scroll-view scroll-y>{{nodeSnip}}</scroll-view>
        <button style="margin: 30rpx 0" type="primary" bindtap="renderNode">渲染Node</button>
        <block wx:if="{{renderedByNode}}">
          <rich-text nodes="{{nodes}}"></rich-text>
        </block>
      </view>
    </view>
  </view>

</view>

2.富文本中预览图片

2.1 原生使用

代码语言：javascript复制

<rich-text space="emsp" nodes="{{nodes}}" bindtap="tap"></rich-text>

代码语言：javascript复制

data: {
  // 示例 1 代码
  nodes: [{
    name: 'div',
    attrs: {
      class: 'div_class',
      style: 'line-height: 20px;padding:20px;'
    },
    children: [
      {
        type: 'text',
        text: '小程序实践'
      }, {
        name: 'img',
        attrs: {
          src: 'https://gimg2.baidu.com/image_search/src=http://img.daimg.com/uploads/allimg/140505/1-140505004P3.jpg&refer=http://img.daimg.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1663946818&t=f4155ceebdd0eb509fd172de7feef3c1',
          style: 'width:100%'
        }
      }, {
        name: 'img',
        attrs: {
          src: 'https://gimg2.baidu.com/image_search/src=http://up.enterdesk.com/edpic/54/7f/7e/547f7eea46e505ecc72a30708959169d.jpg&refer=http://up.enterdesk.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1663946818&t=a5f8d704887bf93acbcd016e6c220d71',
          style: 'width:100%'
          // ,style:'width:100%;font-size:0;display:block;'//修改样式
          ,class: 'img'
        }
      }, {
        name: 'img',
        attrs: {
          src: 'https://gimg2.baidu.com/image_search/src=http://img.pconline.com.cn/images/upload/upc/tx/photoblog/1308/11/c7/24373320_24373320_1376225083921.jpg&refer=http://img.pconline.com.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1663946817&t=abb1d293958695bb875b39a70d79a7b5',
          style: 'width:100%'
        }
      }
    ]
  }],
  urls: [],
},
tap(e) {
  let urls = this.data.urls
  wx.previewImage({
    current: urls[0],
    urls: urls
  })
},
onReady() {
  // 取出 urls
  function findUrl(nodes) {
    let urls = []
    nodes.forEach(item => {
      if (item.name == 'img' && item.attrs) {
        for (const key in item.attrs) {
          if (key == 'src') {
            urls.push(item.attrs[key])
          }
        }
      }
      if (item.children) {
        urls = urls.concat(findUrl(item.children))
      }
    })
    return urls
  }
  this.data.urls = findUrl(this.data.nodes)
},

2.2 组件封装使用

2.2.1 组件封装

项目结构parser

config.js

代码语言：javascript复制

/* 配置文件 */
const canIUse = wx.canIUse('editor'); // 高基础库标识，用于兼容
module.exports = {
  // 过滤器函数
  filter: null,
  // 代码高亮函数
  highlight: null,
  // 文本处理函数
  onText: null,
  blankChar: makeMap(' ,xA0,t,r,n,f'),
  // 块级标签，将被转为 div
  blockTags: makeMap('address,article,aside,body,caption,center,cite,footer,header,html,nav,section'   (canIUse ? '' : ',pre')),
  // 将被移除的标签
  ignoreTags: makeMap('area,base,basefont,canvas,command,embed,frame,iframe,input,isindex,keygen,link,map,meta,param,script,source,style,svg,textarea,title,track,use,wbr'   (canIUse ? ',rp' : '')),
  // 只能被 rich-text 显示的标签
  richOnlyTags: makeMap('a,colgroup,fieldset,legend,picture,table'   (canIUse ? ',bdi,bdo,rt,ruby' : '')),
  // 自闭合的标签
  selfClosingTags: makeMap('area,base,basefont,br,col,circle,ellipse,embed,frame,hr,img,input,isindex,keygen,line,link,meta,param,path,polygon,rect,source,track,use,wbr'),
  // 信任的属性
  trustAttrs: makeMap('align,alt,app-id,author,autoplay,border,cellpadding,cellspacing,class,color,colspan,controls,data-src,dir,face,height,href,id,ignore,loop,media,muted,name,path,poster,rowspan,size,span,src,start,style,type,unit-id,width,xmlns'),
  // bool 型的属性
  boolAttrs: makeMap('autoplay,controls,ignore,loop,muted'),
  // 信任的标签
  trustTags: makeMap('a,abbr,ad,audio,b,blockquote,br,code,col,colgroup,dd,del,dl,dt,div,em,fieldset,h1,h2,h3,h4,h5,h6,hr,i,img,ins,label,legend,li,ol,p,q,source,span,strong,sub,sup,table,tbody,td,tfoot,th,thead,tr,title,ul,video'   (canIUse ? ',bdi,bdo,caption,pre,rt,ruby' : '')),
  // 默认的标签样式
  userAgentStyles: {
    address: 'font-style:italic',
    big: 'display:inline;font-size:1.2em',
    blockquote: 'background-color:#f6f6f6;border-left:3px solid #dbdbdb;color:#6c6c6c;padding:5px 0 5px 10px',
    caption: 'display:table-caption;text-align:center',
    center: 'text-align:center',
    cite: 'font-style:italic',
    dd: 'margin-left:40px',
    mark: 'background-color:yellow',
    pre: 'font-family:monospace;white-space:pre;overflow:scroll',
    s: 'text-decoration:line-through',
    small: 'display:inline;font-size:0.8em',
    u: 'text-decoration:underline'
  }
}

function makeMap(str) {
  var map = {},
    list = str.split(',');
  for (var i = list.length; i--;)
    map[list[i]] = true;
  return map;
}

CssHandler.js

代码语言：javascript复制

/*
  解析和匹配 Css 的选择器
  github：https://github.com/jin-yufeng/Parser
  docs：https://jin-yufeng.github.io/Parser
  author：JinYufeng
  update：2020/03/15
*/
var cfg = require('./config.js');
class CssHandler {
  constructor(tagStyle) {
    var styles = Object.assign({}, cfg.userAgentStyles);
    for (var item in tagStyle)
      styles[item] = (styles[item] ? styles[item]   ';' : '')   tagStyle[item];
    this.styles = styles;
  }
  getStyle = data => this.styles = new CssParser(data, this.styles).parse();
  match(name, attrs) {
    var tmp, matched = (tmp = this.styles[name]) ? tmp   ';' : '';
    if (attrs.class) {
      var items = attrs.class.split(' ');
      for (var i = 0, item; item = items[i]; i  )
        if (tmp = this.styles['.'   item])
          matched  = tmp   ';';
    }
    if (tmp = this.styles['#'   attrs.id])
      matched  = tmp   ';';
    return matched;
  }
}
module.exports = CssHandler;
class CssParser {
  constructor(data, init) {
    this.data = data;
    this.floor = 0;
    this.i = 0;
    this.list = [];
    this.res = init;
    this.state = this.Space;
  }
  parse() {
    for (var c; c = this.data[this.i]; this.i  )
      this.state(c);
    return this.res;
  }
  section = () => this.data.substring(this.start, this.i);
  isLetter = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
  // 状态机
  Space(c) {
    if (c == '.' || c == '#' || this.isLetter(c)) {
      this.start = this.i;
      this.state = this.Name;
    } else if (c == '/' && this.data[this.i   1] == '*')
      this.Comment();
    else if (!cfg.blankChar[c] && c != ';')
      this.state = this.Ignore;
  }
  Comment() {
    this.i = this.data.indexOf('*/', this.i)   1;
    if (!this.i) this.i = this.data.length;
    this.state = this.Space;
  }
  Ignore(c) {
    if (c == '{') this.floor  ;
    else if (c == '}' && !--this.floor) this.state = this.Space;
  }
  Name(c) {
    if (cfg.blankChar[c]) {
      this.list.push(this.section());
      this.state = this.NameSpace;
    } else if (c == '{') {
      this.list.push(this.section());
      this.Content();
    } else if (c == ',') {
      this.list.push(this.section());
      this.Comma();
    } else if (!this.isLetter(c) && (c < '0' || c > '9') && c != '-' && c != '_')
      this.state = this.Ignore;
  }
  NameSpace(c) {
    if (c == '{') this.Content();
    else if (c == ',') this.Comma();
    else if (!cfg.blankChar[c]) this.state = this.Ignore;
  }
  Comma() {
    while (cfg.blankChar[this.data[  this.i]]);
    if (this.data[this.i] == '{') this.Content();
    else {
      this.start = this.i--;
      this.state = this.Name;
    }
  }
  Content() {
    this.start =   this.i;
    if ((this.i = this.data.indexOf('}', this.i)) == -1) this.i = this.data.length;
    var content = this.section();
    for (var i = 0, item; item = this.list[i  ];)
      if (this.res[item]) this.res[item]  = ';'   content;
      else this.res[item] = content;
    this.list = [];
    this.state = this.Space;
  }
}

MpHtmlParser.js

代码语言：javascript复制

/*
  将 html 解析为适用于小程序 rich-text 的 DOM 结构
  github：https://github.com/jin-yufeng/Parser
  docs：https://jin-yufeng.github.io/Parser
  author：JinYufeng
  update：2020/03/26
*/
var cfg = require('./config.js'),
  blankChar = cfg.blankChar,
  CssHandler = require('./CssHandler.js'),
  screenWidth = wx.getSystemInfoSync().screenWidth;
try {
  var emoji = require('./emoji.js.js');
} catch (e) {}
class MpHtmlParser {
  constructor(data, options = {}) {
    this.attrs = {};
    this.compress = options.compress;
    this.CssHandler = new CssHandler(options.tagStyle, screenWidth);
    this.data = data;
    this.domain = options.domain;
    this.DOM = [];
    this.i = this.start = this.audioNum = this.imgNum = this.videoNum = 0;
    this.protocol = this.domain && this.domain.includes('://') ? this.domain.split('://')[0] : 'http';
    this.state = this.Text;
    this.STACK = [];
    this.useAnchor = options.useAnchor;
    this.xml = options.xml;
  }
  parse() {
    if (emoji) this.data = emoji.parseEmoji(this.data);
    for (var c; c = this.data[this.i]; this.i  )
      this.state(c);
    if (this.state == this.Text) this.setText();
    while (this.STACK.length) this.popNode(this.STACK.pop());
    if (this.DOM.length) {
      this.DOM[0].PoweredBy = 'Parser';
      if (this.title) this.DOM[0].title = this.title;
    }
    return this.DOM;
  }
  // 设置属性
  setAttr() {
    var name = this.getName(this.attrName);
    if (cfg.trustAttrs[name]) {
      if (!this.attrVal) {
        if (cfg.boolAttrs[name]) this.attrs[name] = 'T';
      } else if (name == 'src') this.attrs[name] = this.getUrl(this.attrVal.replace(/&/g, '&'));
      else this.attrs[name] = this.attrVal;
    }
    this.attrVal = '';
    while (blankChar[this.data[this.i]]) this.i  ;
    if (this.isClose()) this.setNode();
    else {
      this.start = this.i;
      this.state = this.AttrName;
    }
  }
  // 设置文本节点
  setText() {
    var back, text = this.section();
    if (!text) return;
    text = (cfg.onText && cfg.onText(text, () => back = true)) || text;
    if (back) {
      this.data = this.data.substr(0, this.start)   text   this.data.substr(this.i);
      let j = this.start   text.length;
      for (this.i = this.start; this.i < j; this.i  ) this.state(this.data[this.i]);
      return;
    }
    if (!this.pre) {
      // 合并空白符
      var tmp = [];
      for (let i = text.length, c; c = text[--i];)
        if (!blankChar[c] || (!blankChar[tmp[0]] && (c = ' '))) tmp.unshift(c);
      text = tmp.join('');
      if (text == ' ') return;
    }
    // 处理实体
    var i = -1,
      j, en, siblings = this.siblings();
    while (1) {
      if ((i = text.indexOf('&', i   1)) == -1) break;
      if ((j = text.indexOf(';', i   2)) == -1) break;
      if (text[i   1] == '#') {
        en = parseInt((text[i   2] == 'x' ? '0' : '')   text.substring(i   2, j));
        if (!isNaN(en)) text = text.substr(0, i)   String.fromCharCode(en)   text.substr(j   1);
      } else {
        en = text.substring(i   1, j);
        if (en == 'nbsp')
          text = text.substr(0, i)   'xA0'   text.substr(j   1); // 解决 &nbsp; 失效
        else if (en != 'lt' && en != 'gt' && en != 'amp' && en != 'ensp' && en != 'emsp' && en != 'quot' && en != 'apos') {
          i && siblings.push({
            type: 'text',
            text: text.substr(0, i)
          })
          siblings.push({
            type: 'text',
            text: `&${en};`,
            en: 1
          })
          text = text.substr(j   1);
          i = -1;
        }
      }
    }
    text && siblings.push({
      type: 'text',
      text
    });
  }
  // 设置元素节点
  setNode() {
    var node = {
        name: this.getName(this.tagName),
        attrs: this.attrs
      },
      close = cfg.selfClosingTags[node.name] || (this.xml && this.data[this.i] == '/');
    this.attrs = {};
    if (!cfg.ignoreTags[node.name]) {
      this.matchAttr(node);
      if (!close) {
        node.children = [];
        if (node.name == 'pre' && cfg.highlight) {
          this.remove(node);
          this.pre = node.pre = true;
        }
        this.siblings().push(node);
        this.STACK.push(node);
      } else if (!cfg.filter || cfg.filter(node, this) != false)
        this.siblings().push(node);
    } else {
      if (!close) this.remove(node);
      else if (node.name == 'source') {
        var parent = this.parent(),
          attrs = node.attrs;
        if (parent && attrs.src)
          if (parent.name == 'video' || parent.name == 'audio')
            parent.attrs.source.push(attrs.src);
          else {
            var i, media = attrs.media;
            if (parent.name == 'picture' && !parent.attrs.src && (!media || (media.includes('px') &&
                (((i = media.indexOf('min-width')) != -1 && (i = media.indexOf(':', i   8)) != -1 && screenWidth > parseInt(media.substr(i   1))) ||
                  ((i = media.indexOf('max-width')) != -1 && (i = media.indexOf(':', i   8)) != -1 && screenWidth < parseInt(media.substr(i   1)))))))
              parent.attrs.src = attrs.src;
          }
      } else if (node.name == 'base' && !this.domain) this.domain = node.attrs.href;
    }
    if (this.data[this.i] == '/') this.i  ;
    this.start = this.i   1;
    this.state = this.Text;
  }
  // 移除标签
  remove(node) {
    var name = node.name,
      j = this.i;
    while (1) {
      if ((this.i = this.data.indexOf('</', this.i   1)) == -1) {
        if (name == 'pre' || name == 'svg') this.i = j;
        else this.i = this.data.length;
        return;
      }
      this.start = (this.i  = 2);
      while (!blankChar[this.data[this.i]] && !this.isClose()) this.i  ;
      if (this.getName(this.section()) == name) {
        // 代码块高亮
        if (name == 'pre') {
          this.data = this.data.substr(0, j   1)   cfg.highlight(this.data.substring(j   1, this.i - 5), node.attrs)   this.data.substr(this.i - 5);
          return this.i = j;
        } else if (name == 'style')
          this.CssHandler.getStyle(this.data.substring(j   1, this.i - 7));
        else if (name == 'title')
          this.title = this.data.substring(j   1, this.i - 7);
        if ((this.i = this.data.indexOf('>', this.i)) == -1) this.i = this.data.length;
        // 处理 svg
        if (name == 'svg') {
          var src = this.data.substring(j, this.i   1);
          if (!node.attrs.xmlns) src = ' xmlns="http://www.w3.org/2000/svg"'   src;
          var i = j;
          while (this.data[j] != '<') j--;
          src = this.data.substring(j, i)   src;
          var parent = this.parent();
          if (node.attrs.width == '100%' && parent && (parent.attrs.style || '').includes('inline'))
            parent.attrs.style = 'width:300px;max-width:100%;'   parent.attrs.style;
          this.siblings().push({
            name: 'img',
            attrs: {
              src: 'data:image/svg xml;utf8,'   src.replace(/#/g, '#')
            },
            svg: 1
          })
        }
        return;
      }
    }
  }
  // 处理属性
  matchAttr(node) {
    var attrs = node.attrs,
      style = this.CssHandler.match(node.name, attrs, node)   (attrs.style || ''),
      styleObj = {};
    if (attrs.id) {
      if (this.compress & 1) attrs.id = void 0;
      else if (this.useAnchor) this.bubble();
    }
    if ((this.compress & 2) && attrs.class) attrs.class = void 0;
    switch (node.name) {
      case 'a':
      case 'ad':
        this.bubble();
        break;
      case 'font':
        if (attrs.color) {
          styleObj['color'] = attrs.color;
          attrs.color = void 0;
        }
        if (attrs.face) {
          styleObj['font-family'] = attrs.face;
          attrs.face = void 0;
        }
        if (attrs.size) {
          var size = parseInt(attrs.size);
          if (size < 1) size = 1;
          else if (size > 7) size = 7;
          var map = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
          styleObj['font-size'] = map[size - 1];
          attrs.size = void 0;
        }
        break;
      case 'video':
      case 'audio':
        if (!attrs.id) attrs.id = node.name   (  this[`${node.name}Num`]);
        else this[`${node.name}Num`]  ;
        if (node.name == 'video' && this.videoNum > 3) node.lazyLoad = 1;
        attrs.source = [];
        if (attrs.src) attrs.source.push(attrs.src);
        if (!attrs.controls && !attrs.autoplay)
          console.warn(`存在没有 controls 属性的 ${node.name} 标签，可能导致无法播放`, node);
        this.bubble();
        break;
      case 'td':
      case 'th':
        if (attrs.colspan || attrs.rowspan)
          for (var k = this.STACK.length, item; item = this.STACK[--k];)
            if (item.name == 'table') {
              item.c = void 0;
              break;
            }
    }
    if (attrs.align) {
      styleObj['text-align'] = attrs.align;
      attrs.align = void 0;
    }
    if (attrs.width) {
      styleObj.width = parseFloat(attrs.width)   (attrs.width.includes('%') ? '%' : 'px');
      attrs.width = void 0;
    }
    if (attrs.height) {
      styleObj.height = parseFloat(attrs.height)   (attrs.height.includes('%') ? '%' : 'px');
      attrs.height = void 0;
    }
    // 压缩 style
    var styles = style.replace(/&quot;/g, '"').replace(/&amp;/g, '&').split(';');
    style = '';
    for (var i = 0, len = styles.length; i < len; i  ) {
      var info = styles[i].split(':');
      if (info.length < 2) continue;
      let key = info[0].trim().toLowerCase(),
        value = info.slice(1).join(':').trim();
      if (value.includes('-webkit') || value.includes('-moz') || value.includes('-ms') || value.includes('-o') || value.includes('safe'))
        style  = `;${key}:${value}`;
      else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import'))
        styleObj[key] = value;
    }
    if (node.name == 'img' || node.name == 'picture') {
      if (attrs['data-src']) {
        attrs.src = attrs.src || attrs['data-src'];
        attrs['data-src'] = void 0;
      }
      if ((attrs.src || node.name == 'picture') && !attrs.ignore) {
        if (this.bubble()) {
          if ((attrs.src || '').includes('.webp')) node.webp = 1;
          attrs.i = (this.imgNum  ).toString();
        } else attrs.ignore = 'T';
      }
      if (attrs.ignore) styleObj['max-width'] = '100%';
      var check = item => styleObj[item] && !styleObj[item].includes('auto');
      if (check('width')) {
        var parent = this.parent();
        if (styleObj.width.includes('%') && parent && (parent.attrs.style || '').includes('inline')) {
          parent.attrs.style  = ';max-width:100%'
          node.auto = 1;
        }
        if (parseInt(styleObj.width) > screenWidth)
          styleObj.height = 'auto';
        if (check('height')) node.mode = 'scaleToFill';
      } else if (check('height')) node.mode = 'heightFix';
      else node.auto = 1;
    }
    for (var key in styleObj) {
      var value = styleObj[key];
      if (key.includes('flex') || key == 'order' || key == 'self-align') node.c = 1;
      // 填充链接
      if (value.includes('url')) {
        var j = value.indexOf('(');
        if (j   != -1) {
          while (value[j] == '"' || value[j] == "'" || blankChar[value[j]]) j  ;
          value = value.substr(0, j)   this.getUrl(value.substr(j));
        }
      }
      // 转换 rpx
      else if (value.includes('rpx'))
        value = value.replace(/[0-9.s]*rpx/g, $ => parseFloat($) * screenWidth / 750   'px');
      else if (key == 'white-space' && value.includes('pre'))
        this.pre = node.pre = true;
      style  = `;${key}:${value}`;
    }
    style = style.substr(1);
    if (style) attrs.style = style;
  }
  // 节点出栈处理
  popNode(node) {
    // 空白符处理
    if (node.pre) {
      node.pre = this.pre = void 0;
      for (let i = this.STACK.length; i--;)
        if (this.STACK[i].pre)
          this.pre = true;
    }
    if (node.name == 'head' || (cfg.filter && cfg.filter(node, this) == false))
      return this.siblings().pop();
    var attrs = node.attrs;
    // 替换一些标签名
    if (node.name == 'picture') {
      node.name = 'img';
      if (!attrs.src && (node.children[0] || '').name == 'img')
        attrs.src = node.children[0].attrs.src;
      return node.children = void 0;
    }
    if (cfg.blockTags[node.name]) node.name = 'div';
    else if (!cfg.trustTags[node.name]) node.name = 'span';
    // 处理列表
    if (node.c) {
      if (node.name == 'ul') {
        var floor = 1;
        for (let i = this.STACK.length; i--;)
          if (this.STACK[i].name == 'ul') floor  ;
        if (floor != 1)
          for (let i = node.children.length; i--;)
            node.children[i].floor = floor;
      } else if (node.name == 'ol') {
        for (let i = 0, num = 1, child; child = node.children[i  ];)
          if (child.name == 'li') {
            child.type = 'ol';
            child.num = ((num, type) => {
              if (type == 'a') return String.fromCharCode(97   (num - 1) % 26);
              if (type == 'A') return String.fromCharCode(65   (num - 1) % 26);
              if (type == 'i' || type == 'I') {
                num = (num - 1) % 99   1;
                var one = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'],
                  ten = ['X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC'],
                  res = (ten[Math.floor(num / 10) - 1] || '')   (one[num % 10 - 1] || '');
                if (type == 'i') return res.toLowerCase();
                return res;
              }
              return num;
            })(num  , attrs.type)   '.';
          }
      }
    }
    // 处理表格的边框
    if (node.name == 'table') {
      var padding = attrs.cellpadding,
        spacing = attrs.cellspacing,
        border = attrs.border;
      if (node.c) {
        this.bubble();
        attrs.style = (attrs.style || '')   ';display:table';
        if (!padding) padding = 2;
        if (!spacing) spacing = 2;
      }
      if (border) attrs.style = `border:${border}px solid gray;${attrs.style || ''}`;
      if (spacing) attrs.style = `border-spacing:${spacing}px;${attrs.style || ''}`;
      if (border || padding || node.c)
        (function f(ns) {
          for (var i = 0, n; n = ns[i]; i  ) {
            var style = n.attrs.style || '';
            if (node.c && n.name[0] == 't') {
              n.c = 1;
              style  = ';display:table-'   (n.name == 'th' || n.name == 'td' ? 'cell' : (n.name == 'tr' ? 'row' : 'row-group'));
            }
            if (n.name == 'th' || n.name == 'td') {
              if (border) style = `border:${border}px solid gray;${style}`;
              if (padding) style = `padding:${padding}px;${style}`;
            } else f(n.children || []);
            if (style) n.attrs.style = style;
          }
        })(node.children)
    }
    this.CssHandler.pop && this.CssHandler.pop(node);
    // 自动压缩
    if (node.name == 'div' && !Object.keys(attrs).length) {
      var siblings = this.siblings();
      if (!(node.children || []).length) siblings.pop();
      else if (node.children.length == 1 && node.children[0].name == 'div')
        siblings[siblings.length - 1] = node.children[0];
    }
  }
  // 工具函数
  bubble() {
    for (var i = this.STACK.length, item; item = this.STACK[--i];) {
      if (cfg.richOnlyTags[item.name]) {
        if (item.name == 'table' && !Object.hasOwnProperty.call(item, 'c')) item.c = 1;
        return false;
      }
      item.c = 1;
    }
    return true;
  }
  getUrl(url) {
    if (url[0] == '/') {
      if (url[1] == '/') url = this.protocol   ':'   url;
      else if (this.domain) url = this.domain   url;
    } else if (this.domain && url.indexOf('data:') != 0 && !url.includes('://'))
      url = this.domain   '/'   url;
    return url;
  }
  getName = val => this.xml ? val : val.toLowerCase();
  isClose = () => this.data[this.i] == '>' || (this.data[this.i] == '/' && this.data[this.i   1] == '>');
  section = () => this.data.substring(this.start, this.i);
  parent = () => this.STACK[this.STACK.length - 1];
  siblings = () => this.STACK.length ? this.parent().children : this.DOM;
  // 状态机
  Text(c) {
    if (c == '<') {
      var next = this.data[this.i   1],
        isLetter = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
      if (isLetter(next)) {
        this.setText();
        this.start = this.i   1;
        this.state = this.TagName;
      } else if (next == '/') {
        this.setText();
        if (isLetter(this.data[  this.i   1])) {
          this.start = this.i   1;
          this.state = this.EndTag;
        } else this.Comment();
      } else if (next == '!') {
        this.setText();
        this.Comment();
      }
    }
  }
  Comment() {
    var key;
    if (this.data.substring(this.i   2, this.i   4) == '--') key = '-->';
    else if (this.data.substring(this.i   2, this.i   9) == '[CDATA[') key = ']]>';
    else key = '>';
    if ((this.i = this.data.indexOf(key, this.i   2)) == -1) this.i = this.data.length;
    else this.i  = key.length - 1;
    this.start = this.i   1;
    this.state = this.Text;
  }
  TagName(c) {
    if (blankChar[c]) {
      this.tagName = this.section();
      while (blankChar[this.data[this.i]]) this.i  ;
      if (this.isClose()) this.setNode();
      else {
        this.start = this.i;
        this.state = this.AttrName;
      }
    } else if (this.isClose()) {
      this.tagName = this.section();
      this.setNode();
    }
  }
  AttrName(c) {
    var blank = blankChar[c];
    if (blank) {
      this.attrName = this.section();
      c = this.data[this.i];
    }
    if (c == '=') {
      if (!blank) this.attrName = this.section();
      while (blankChar[this.data[  this.i]]);
      this.start = this.i--;
      this.state = this.AttrValue;
    } else if (blank) this.setAttr();
    else if (this.isClose()) {
      this.attrName = this.section();
      this.setAttr();
    }
  }
  AttrValue(c) {
    if (c == '"' || c == "'") {
      this.start  ;
      if ((this.i = this.data.indexOf(c, this.i   1)) == -1) return this.i = this.data.length;
      this.attrVal = this.section();
      this.i  ;
    } else {
      for (; !blankChar[this.data[this.i]] && !this.isClose(); this.i  );
      this.attrVal = this.section();
    }
    this.setAttr();
  }
  EndTag(c) {
    if (blankChar[c] || c == '>' || c == '/') {
      var name = this.getName(this.section());
      for (var i = this.STACK.length; i--;)
        if (this.STACK[i].name == name) break;
      if (i != -1) {
        var node;
        while ((node = this.STACK.pop()).name != name);
        this.popNode(node);
      } else if (name == 'p' || name == 'br')
        this.siblings().push({
          name,
          attrs: {}
        });
      this.i = this.data.indexOf('>', this.i);
      this.start = this.i   1;
      if (this.i == -1) this.i = this.data.length;
      else this.state = this.Text;
    }
  }
}
module.exports = MpHtmlParser;

handler.wxs

代码语言：javascript复制

var inlineTags = {
  abbr: 1,
  b: 1,
  big: 1,
  code: 1,
  del: 1,
  em: 1,
  i: 1,
  ins: 1,
  label: 1,
  q: 1,
  small: 1,
  span: 1,
  strong: 1
}
module.exports = {
  // 获取图片大小
  load: function (e) {
    if (e.target.dataset.auto)
      e.instance.setStyle({
        width: e.detail.width   'px'
      })
  },
  // 链接点击态
  visited: function (e, owner) {
    if (!e.instance.hasClass('_visited'))
      e.instance.addClass('_visited')
    owner.callMethod('linkpress', e);
  },
  // 是否通过 rich-text 显示
  useRichText: function (item) {
    return !item.c && !inlineTags[item.name] && (item.attrs.style || '').indexOf('display:inline') == -1
  }
}

trees.js

代码语言：javascript复制

/*
  trees 递归子组件
  github：https://github.com/jin-yufeng/Parser
  docs：https://jin-yufeng.github.io/Parser
  author：JinYufeng
  update：2020/03/23
*/
Component({
  data: {
    canIUse: !!wx.chooseMessageFile
  },
  properties: {
    nodes: Array,
    lazyLoad: Boolean
  },
  methods: {
    // 视频播放事件
    play(e) {
      this.top.group && this.top.group.pause(this.top.i);
      if (this.top.videoContexts.length > 1 && this.top.data.autopause)
        for (var i = this.top.videoContexts.length; i--;)
          if (this.top.videoContexts[i].id != e.currentTarget.id)
            this.top.videoContexts[i].pause();
    },
// 图片点击事件
imgtap(e) {
  var attrs = e.target.dataset.attrs;
  if (!attrs.ignore) {
    var preview = true;
    this.top.triggerEvent('imgtap', {
      id: e.target.id,
      src: attrs.src,
      ignore: () => preview = false
    })
    if (preview) {
      if (this.top.group) return this.top.group.preview(this.top.i, attrs.i);
      var urls = this.top.imgList,
        current = urls[attrs.i] ? urls[attrs.i] : (urls = [attrs.src], attrs.src);
      wx.previewImage({
        current,
        urls
      })
    }
  }
},
    // 链接点击事件
    linkpress(e) {
      var jump = true,
        attrs = e.currentTarget.dataset.attrs;
      attrs.ignore = () => jump = false;
      this.top.triggerEvent('linkpress', attrs);
      if (jump) {
        if (attrs['app-id'])
          wx.navigateToMiniProgram({
            appId: attrs['app-id'],
            path: attrs.path
          })
        else if (attrs.href) {
          if (attrs.href[0] == '#')
            this.top.navigateTo({
              id: attrs.href.substring(1)
            })
          else if (attrs.href.indexOf('http') == 0 || attrs.href.indexOf('//') == 0)
            wx.setClipboardData({
              data: attrs.href,
              success: () =>
                wx.showToast({
                  title: '链接已复制'
                })
            })
          else
            wx.navigateTo({
              url: attrs.href,
            })
        }
      }
    },
    // 错误事件
    error(e) {
      var context, src = '',
        source = e.target.dataset.source,
        i = e.target.dataset.i,
        node = this.data.nodes[i];
      if (source == 'video' || source == 'audio') {
        // 加载其他 source
        var index = (node.i || 0)   1;
        if (index < node.attrs.source.length)
          return this.setData({
            [`nodes[${i}].i`]: index
          })
        if (this.top) context = this.top.getVideoContext(e.target.id);
      } else if (source == 'img')
        context = {
          setSrc: (newSrc) => src = newSrc
        }
      this.top && this.top.triggerEvent('error', {
        source,
        target: e.target,
        context,
        ...e.detail
      })
      if (source == 'img') {
        var data = {
          [`nodes[${i}].attrs.src`]: src
        }
        if (!src) data[`nodes[${i}].err`] = 1;
        this.setData(data);
      }
    },
    // 加载视频
    loadVideo(e) {
      var i = e.target.dataset.i;
      this.setData({
        [`nodes[${i}].lazyLoad`]: false,
        [`nodes[${i}].attrs.autoplay`]: true
      })
    },
    // 加载图片
    loadImg(e) {
      var data = e.target.dataset;
      if (data.auto)
        this.setData({
          [`nodes[${data.i}].attrs.style`]: `${this.data.nodes[data.i].attrs.style};width:${e.detail.width}px`
        })
    }
  }
})

trees.json

代码语言：javascript复制

{
  "component": true,
  "usingComponents": {
    "trees": "./trees"
  }
}

trees.wxml

代码语言：javascript复制

<!--trees 递归子组件-->
<wxs module="handler" src="./handler.wxs" />
<block wx:for="{{nodes}}" wx:key="index" wx:for-item="n">
  <rich-text wx:if="{{n.en||n.svg||n.err}}" class="_svg" nodes="{{[n]}}" />
<!--图片-->
<image wx:elif="{{n.name=='img'}}" class="_img" style="{{n.attrs.style}}" src="{{n.attrs.src}}" lazy-load="{{lazyLoad}}" mode="{{n.mode||'widthFix'}}" show-menu-by-longpress="{{!n.attrs.ignore}}" webp="{{n.webp}}" data-attrs="{{n.attrs}}" data-i="{{index}}" data-auto="{{n.auto}}" data-source="img" bindtap="imgtap" bindload="{{canIUse?handler.load:'loadImg'}}" binderror="error" />
  <!--文本-->
  <text wx:elif="{{n.type=='text'}}" decode>{{n.text}}</text>
  <text wx:elif="{{n.name=='br'}}">n</text>
  <!--链接-->
  <view wx:elif="{{n.name=='a'}}" class="_a {{n.attrs.class}}" hover-class="_hover" style="{{n.attrs.style}}" data-attrs="{{n.attrs}}" bindtap="{{canIUse?handler.visited:'linkpress'}}">
    <trees nodes="{{n.children}}" />
  </view>
  <!--视频-->
  <block wx:elif="{{n.name=='video'}}">
    <view wx:if="{{n.lazyLoad}}" id="{{n.attrs.id}}" class="_video {{n.attrs.class}}" style="{{n.attrs.style}}" data-i="{{index}}" bindtap="loadVideo" />
    <video wx:else id="{{n.attrs.id}}" class="{{n.attrs.class}}" style="{{n.attrs.style}}" autoplay="{{n.attrs.autoplay}}" controls="{{n.attrs.controls}}" loop="{{n.attrs.loop}}" muted="{{n.attrs.muted}}" poster="{{n.attrs.poster}}" src="{{n.attrs.source[n.i||0]}}" unit-id="{{n.attrs['unit-id']}}" data-i="{{index}}" data-source="video" binderror="error" bindplay="play" />
  </block>
  <!--音频-->
  <audio wx:elif="{{n.name=='audio'}}" id="{{n.attrs.id}}" class="{{n.attrs.class}}" style="{{n.attrs.style}}" author="{{n.attrs.author}}" autoplay="{{n.attrs.autoplay}}" controls="{{n.attrs.controls}}" loop="{{n.attrs.loop}}" name="{{n.attrs.name}}" poster="{{n.attrs.poster}}" src="{{n.attrs.source[n.i||0]}}" data-i="{{index}}" data-source="audio" binderror="error" bindplay="play" />
  <!--广告-->
  <ad wx:elif="{{n.name=='ad'}}" class="{{n.attrs.class}}" style="{{n.attrs.style}}" unit-id="{{n.attrs['unit-id']}}" data-source="ad" binderror="error" />
  <!--列表-->
  <view wx:elif="{{n.name=='li'}}" class="{{n.attrs.class}}" style="{{n.attrs.style}};display:flex">
    <view wx:if="{{n.type=='ol'}}" class="_ol-bef">{{n.num}}</view>
    <view wx:else class="_ul-bef">
      <view wx:if="{{n.floor%3==0}}" class="_ul-p1">█</view>
      <view wx:elif="{{n.floor%3==2}}" class="_ul-p2" />
      <view wx:else class="_ul-p1" style="border-radius:50%">█</view>
    </view>
    <trees class="_node _li" lazy-load="{{lazyLoad}}" nodes="{{n.children}}" />
  </view>
  <!--富文本-->
  <rich-text wx:elif="{{handler.useRichText(n)}}" id="{{n.attrs.id}}" class="_p __{{n.name}}" nodes="{{[n]}}" />
  <!--继续递归-->
  <trees wx:else id="{{n.attrs.id}}" class="_node _{{n.name}} {{n.attrs.class}}" style="{{n.attrs.style}}" lazy-load="{{lazyLoad}}" nodes="{{n.children}}" />
</block>

trees.wxss

代码语言：javascript复制

/* 在这里引入自定义样式 */

/* 链接和图片效果 */
._a {
  color: #366092;
  display: inline;
  padding: 1.5px 0 1.5px 0;
  word-break: break-all;
}
._hover {
  opacity: 0.7;
  text-decoration: underline;
}
._visited {
  color: #551a8b;
}
._img {
  height: 50px;
  max-width: 100%;
}
/* 内部样式 */
:host {
  display: inline;
}
._blockquote, ._div, ._p, ._ul, ._ol, ._li {
  display: block;
}
._b, ._strong {
  font-weight: bold;
}
._code {
  font-family: monospace;
}
._del {
  text-decoration: line-through;
}
._em, ._i {
  font-style: italic;
}
._h1 {
  font-size: 2em;
}
._h2 {
  font-size: 1.5em;
}
._h3 {
  font-size: 1.17em;
}
._h5 {
  font-size: 0.83em;
}
._h6 {
  font-size: 0.67em;
}
._h1, ._h2, ._h3, ._h4, ._h5, ._h6 {
  display: block;
  font-weight: bold;
}
._ins {
  text-decoration: underline;
}
._li {
  flex: 1;
  width: 0;
}
._ol-bef {
  margin-right: 5px;
  text-align: right;
  width: 36px;
}
._ul-bef {
  line-height: normal;
  margin: 0 12px 0 23px;
}
._ol-bef, ._ul_bef {
  flex: none;
  user-select: none;
}
._ul-p1 {
  display: inline-block;
  height: 0.3em;
  line-height: 0.3em;
  overflow: hidden;
  width: 0.3em;
}
._ul-p2 {
  border: 0.05em solid black;
  border-radius: 50%;
  display: inline-block;
  height: 0.23em;
  width: 0.23em;
}
._q::before {
  content: '"';
}
._q::after {
  content: '"';
}
._sub {
  font-size: smaller;
  vertical-align: sub;
}
._sup {
  font-size: smaller;
  vertical-align: super;
}
.__bdi, .__bdo, .__ruby, .__rt, ._svg {
  display: inline-block;
}
._video {
  background-color: black;
  display: inline-block;
  height: 225px;
  position: relative;
  width: 300px;
}
._video::after {
  border-left-color: white;
  border-style: solid;
  border-width: 15px 0 15px 30px;
  content: '';
  left: 50%;
  margin: -15px 0 0 -15px;
  position: absolute;
  top: 50%;
}

parser.js

代码语言：javascript复制

/*
  parser 主组件
  github：https://github.com/jin-yufeng/Parser
  docs：https://jin-yufeng.github.io/Parser
  author：JinYufeng
  update：2020/03/26
*/
var cache = {},
  Parser = require('./libs/MpHtmlParser.js'),
  fs = wx.getFileSystemManager && wx.getFileSystemManager();
try {
  var dom = require('./libs/document.js.js');
} catch (e) {}
// 计算 cache 的 key
function hash(str) {
  for (var i = str.length, val = 5381; i--;)
    val  = (val << 5)   str.charCodeAt(i);
  return val;
}
Component({
  options: {
    pureDataPattern: /^[acdgtux]|W/
  },
  properties: {
    'html': {
      type: null,
      observer(html) {
        if (this._refresh) this._refresh = false;
        else this.setContent(html, false, true);
      }
    },
    'autosetTitle': {
      type: Boolean,
      value: true
    },
    'autopause': {
      type: Boolean,
      value: true
    },
    'compress': Number,
    'domain': String,
    'gestureZoom': Boolean,
    'lazyLoad': Boolean,
    'selectable': Boolean,
    'tagStyle': Object,
    'showWithAnimation': Boolean,
    'useAnchor': Boolean,
    'useCache': Boolean,
	'xml': Boolean
  },
  relations: {
    '../parser-group/parser-group': {
      type: 'ancestor'
    }
  },
  created() {
    // 图片数组
    this.imgList = [];
    this.imgList.setItem = function(i, src) {
      if (!i || !src) return;
      // 去重
      if (src.indexOf('http') == 0 && this.includes(src)) {
        var newSrc = '';
        for (var j = 0, c; c = src[j]; j  ) {
          if (c == '/' && src[j - 1] != '/' && src[j   1] != '/') break;
          newSrc  = Math.random() > 0.5 ? c.toUpperCase() : c;
        }
        newSrc  = src.substr(j);
        return this[i] = newSrc;
      }
      this[i] = src;
      // 暂存 data src
      if (src.includes('data:image')) {
        var info = src.match(/data:image/(S ?);(S ?),(. )/);
        if (!info) return;
        var filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
        fs && fs.writeFile({
          filePath,
          data: info[3],
          encoding: info[2],
          success: () => this[i] = filePath
        })
      }
    }
    this.imgList.each = function(f) {
      for (var i = 0, len = this.length; i < len; i  )
        this.setItem(i, f(this[i], i, this));
    }
  },
  detached() {
    // 删除暂存
    this.imgList.each(src => {
      if (src && src.includes(wx.env.USER_DATA_PATH) && fs)
        fs.unlink({
          filePath: src
        })
    })
    clearInterval(this._timer);
  },
  methods: {
    // 锚点跳转
    navigateTo(obj) {
      if (!this.data.useAnchor)
        return obj.fail && obj.fail({
          errMsg: 'Anchor is disabled'
        })
      this.createSelectorQuery()
        .select('.top'   (obj.id ? '>>>#'   obj.id : '')).boundingClientRect()
        .selectViewport().scrollOffset().exec(res => {
          if (!res[0])
            return this.group ? this.group.navigateTo(this.i, obj) :
              obj.fail && obj.fail({
                errMsg: 'Label not found'
              });
          obj.scrollTop = res[1].scrollTop   res[0].top;
          wx.pageScrollTo(obj);
        })
    },
    // 获取文本
    getText(ns = this.data.html) {
      var txt = '';
      for (var i = 0, n; n = ns[i  ];) {
        if (n.type == 'text') txt  = n.text.replace(/&nbsp;/g, 'u00A0').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&amp;/g, '&');
        else if (n.type == 'br') txt  = 'n';
        else {
          // 块级标签前后加换行
          var br = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n.name[1] > '0' && n.name[1] < '7');
          if (br && txt && txt[txt.length - 1] != 'n') txt  = 'n';
          if (n.children) txt  = this.getText(n.children);
          if (br && txt[txt.length - 1] != 'n') txt  = 'n';
          else if (n.name == 'td' || n.name == 'th') txt  = 't';
        }
      }
      return txt;
    },
    // 获取视频 context
    getVideoContext(id) {
      if (!id) return this.videoContexts;
      for (var i = this.videoContexts.length; i--;)
        if (this.videoContexts[i].id == id) return this.videoContexts[i];
    },
    // 渲染富文本
    setContent(html, append, _watch) {
      var data = {};
      if (!html) {
        if (_watch || append) return;
        data.html = '';
      } else if (typeof html == 'string') {
        let parser = new Parser(html, this.data);
        // 缓存读取
        if (this.data.useCache) {
          var hashVal = hash(html);
          if (cache[hashVal]) data.html = cache[hashVal];
          else {
            data.html = parser.parse();
            cache[hashVal] = data.html;
          }
        } else data.html = parser.parse();
        this._refresh = true;
        this.triggerEvent('parse', data.html);
      } else if (html.constructor == Array) {
        // 转换不符合格式的 array
        if (html.length && html[0].PoweredBy != 'Parser') {
          let parser = new Parser('', this.data);
          (function f(ns) {
            for (var i = 0, n; n = ns[i]; i  ) {
              if (n.type == 'text') continue;
              n.attrs = n.attrs || {};
              for (var key in n.attrs)
                if (typeof n.attrs[key] != 'string') n.attrs[key] = n.attrs[key].toString();
              parser.matchAttr(n);
              if (n.children) {
                parser.STACK.push(n);
                f(n.children);
                parser.popNode(parser.STACK.pop());
              }
            }
          })(html);
          data.html = html;
        }
        if (!_watch) data.html = html;
      } else if (typeof html == 'object' && html.nodes) {
        data.html = html.nodes;
        console.warn('错误的 html 类型：object 类型已废弃');
      } else
        return console.warn('错误的 html 类型：'   typeof html);
      if (append) {
        this._refresh = true;
        data.html = (this.data.html || []).concat(data.html);
      } else if (this.data.showWithAnimation) data.showAm = 'animation: show .5s';
      if (data.html || data.showAm) this.setData(data);
      // 设置标题
      if (this.data.html.length && this.data.html[0].title && this.data.autosetTitle)
        wx.setNavigationBarTitle({
          title: this.data.html[0].title
        })
      this.imgList.length = 0;
      this.videoContexts = [];
      if (dom) this.document = new dom(this.data.html, 'html', this);
      var ns = this.selectAllComponents('.top,.top>>>._node');
      for (let i = 0, n; n = ns[i  ];) {
        n.top = this;
        for (var j = 0, item; item = n.data.nodes[j  ];) {
          if (item.c) continue;
          // 获取图片列表
          if (item.name == 'img')
            this.imgList.setItem(item.attrs.i, item.attrs.src);
          // 音视频控制
          else if (item.name == 'video' || item.name == 'audio') {
            var ctx;
            if (item.name == 'video') ctx = wx.createVideoContext(item.attrs.id, n);
            else ctx = n.selectComponent('#'   item.attrs.id);
            if (ctx) {
              ctx.id = item.attrs.id;
              this.videoContexts.push(ctx);
            }
          }
        }
      }
      (wx.nextTick || setTimeout)(() => this.triggerEvent('load'), 50);
      var height;
      clearInterval(this._timer);
      this._timer = setInterval(() => {
        this.createSelectorQuery().select('.top').boundingClientRect(res => {
          this.rect = res;
          if (res.height == height) {
            this.triggerEvent('ready', res)
            clearInterval(this._timer);
          }
          height = res.height;
        }).exec();
      }, 350)
    },
    // 预加载
    preLoad(html, num) {
      if (typeof html == 'string') {
        var id = hash(html);
        html = new Parser(html, this.data).parse();
        cache[id] = html;
      }
      var imgs, wait = [];
      (function f(ns) {
        for (var i = 0, n; n = ns[i  ];) {
          if (n.name == 'img' && n.attrs.src && !wait.includes(n.attrs.src))
            wait.push(n.attrs.src);
          f(n.children || []);
        }
      })(html);
      if (num) wait = wait.slice(0, num);
      this._wait = (this._wait || []).concat(wait);
      if (!this.data.imgs) imgs = this._wait.splice(0, 15);
      else if (this.data.imgs.length < 15)
        imgs = this.data.imgs.concat(this._wait.splice(0, 15 - this.data.imgs.length));
      imgs && this.setData({
        imgs
      });
    },
    _load(e) {
      if (this._wait.length)
        this.setData({
          [`imgs[${e.target.id}]`]: this._wait.shift()
        })
    },
    // 事件处理
    _tap(e) {
      if (this.data.gestureZoom && e.timeStamp - this._lastT < 300) {
        var initY = e.detail.y - e.currentTarget.offsetTop;
        if (this._zoom) {
          this._scaleAm.translateX(0).scale(1).step();
          wx.pageScrollTo({
            scrollTop: (initY   this._initY) / 2 - e.touches[0].clientY,
            duration: 400
          })
        } else {
          var initX = e.detail.x - e.currentTarget.offsetLeft;
          this._initY = initY;
          this._scaleAm = wx.createAnimation({
            transformOrigin: `${initX}px ${this._initY}px 0`,
            timingFunction: 'ease-in-out'
          });
          this._scaleAm.scale(2).step();
          this._tMax = initX / 2;
          this._tMin = (initX - this.rect.width) / 2;
          this._tX = 0;
        }
        this._zoom = !this._zoom;
        this.setData({
          scaleAm: this._scaleAm.export()
        })
      }
      this._lastT = e.timeStamp;
    },
    _touchstart(e) {
      if (e.touches.length == 1)
        this._initX = this._lastX = e.touches[0].pageX;
    },
    _touchmove(e) {
      var diff = e.touches[0].pageX - this._lastX;
      if (this._zoom && e.touches.length == 1 && Math.abs(diff) > 20) {
        this._lastX = e.touches[0].pageX;
        if ((this._tX <= this._tMin && diff < 0) || (this._tX >= this._tMax && diff > 0)) return;
        this._tX  = diff * Math.abs(this._lastX - this._initX) * 0.05;
        if (this._tX < this._tMin) this._tX = this._tMin;
        if (this._tX > this._tMax) this._tX = this._tMax;
        this._scaleAm.translateX(this._tX).step();
        this.setData({
          scaleAm: this._scaleAm.export()
        })
      }
    }
  }
})

parser.json

代码语言：javascript复制

{
  "component": true,
  "usingComponents": {
    "trees": "./trees/trees"
  }
}

parser.wxml

代码语言：javascript复制

<!--parser 主组件-->
<slot wx:if="{{!html[0].name&&!html[0].type}}" />
<trees class="top" style="{{selectable?'user-select:text;-webkit-user-select:text;':''}}{{showAm}}" animation="{{scaleAm}}" lazy-load="{{lazyLoad}}" nodes="{{html[0].name||html[0].type?html:[]}}" bindtap="_tap" bindtouchstart="_touchstart" bindtouchmove="_touchmove" />
<image wx:for="{{imgs}}" wx:key="index" id="{{index}}" src="{{item}}" hidden bindload="_load" />

parser.wxss

代码语言：javascript复制

:host {
  display: block;
  overflow: scroll;
  -webkit-overflow-scrolling: touch;
}
.top {
  display: inherit;
}
@keyframes show {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

2.2.2 组件使用

代码语言：javascript复制

{
  "usingComponents": {
    "parser":"../../components/parser/parser"
  }
}

代码语言：javascript复制

<parser bindimgtap="onTapImage" html="{{html}}" tag-style="{{tagStyle}}" />

代码语言：javascript复制

data: {
    tagStyle: {
      img: 'font-size:0;display:block;',
    },
    html:"<div>小程序实践<span>message</span><img src='https://gimg2.baidu.com/image_search/src=http://img.daimg.com/uploads/allimg/140505/1-140505004P3.jpg&refer=http://img.daimg.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1663946818&t=f4155ceebdd0eb509fd172de7feef3c1' /><img src='https://gimg2.baidu.com/image_search/src=http://img.pconline.com.cn/images/upload/upc/tx/photoblog/1308/11/c7/24373320_24373320_1376225083921.jpg&refer=http://img.pconline.com.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1663946817&t=abb1d293958695bb875b39a70d79a7b5' /></div>"
},
onTapImage(e) {
  console.log('iamge url', e.detail.src)
}

二、文本

1.文本属性

属性	类型	默认值	必填	说明	最低版本
selectable	boolean	false	否	文本是否可选 (已废弃)	1.1.0
user-select	boolean	false	否	文本是否可选，该属性会使文本节点显示为 inline-block	2.12.1
space	string		否	显示连续空格	1.4.0
decode	boolean	false	否	是否解码	1.4.0

代码语言：javascript复制

const texts = [
  '2011年1月，微信1.0发布',
  '同年5月，微信2.0语音对讲发布',
  '10月，微信3.0新增摇一摇功能',
  '2012年3月，微信用户突破1亿',
  '4月份，微信4.0朋友圈发布',
  '同年7月，微信4.2发布公众平台',
  '2013年8月，微信5.0发布微信支付',
  '2014年9月，企业号发布',
  '同月，发布微信卡包',
  '2015年1月，微信第一条朋友圈广告',
  '2016年1月，企业微信发布',
  '2017年1月，小程序发布',
  '......'
]

Page({
  onShareAppMessage() {
    return {
      title: 'text',
      path: 'page/component/pages/text/text'
    }
  },

  data: {
    text: '',
    canAdd: true,
    canRemove: false
  },
  extraLine: [],

  add() {
    this.extraLine.push(texts[this.extraLine.length % 12])
    this.setData({
      text: this.extraLine.join('n'),
      canAdd: this.extraLine.length < 12,
      canRemove: this.extraLine.length > 0
    })
    setTimeout(() => {
      this.setData({
        scrollTop: 99999
      })
    }, 0)
  },
  remove() {
    if (this.extraLine.length > 0) {
      this.extraLine.pop()
      this.setData({
        text: this.extraLine.join('n'),
        canAdd: this.extraLine.length < 12,
        canRemove: this.extraLine.length > 0,
      })
    }
    setTimeout(() => {
      this.setData({
        scrollTop: 99999
      })
    }, 0)
  }
})

代码语言：javascript复制

<view class="container">
  <view class="page-body">
    <view class="page-section page-section-spacing">
      <view class="text-box" scroll-y="true" scroll-top="{{scrollTop}}">
        <text>{{text}}</text>
      </view>
      <button disabled="{{!canAdd}}" bindtap="add">add line</button>
      <button disabled="{{!canRemove}}" bindtap="remove">remove line</button>
    </view>
  </view>
</view>

json 编程算法 javascript html 数据结构

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