关于前后端交互中，前端常用的js处理Ajax接收到的json数据，进行后续的读取、遍历操作，以实现页面数据填充等。 常见场景（以微博热搜为例），
json读操作
先，从接口处爬下来
代码语言：javascript复制url ='https://weibo.com/ajax/side/hotSearch'
headers = {
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36'
}
# 响应
r = requests.get(url,headers)再，存储为文本一定要保存为json字符形式，保存r.json去json.cn上都解析不出来
with open('D:/Temp/hot_search_ranking/data/data.json','w',encoding='utf-8') as fp:
fp.write(r.text) json字符形式(如下，键值对都带引号)
{"label_name":"","star_word":0,"word":"法国发现新冠新变异毒株IHU","category":"社会新闻","num":1282883,"subject_querys":"","flag":0,"onboard_time":1641383803,"raw_hot":1282883,"note":"法国发现新冠新变异毒株IHU","emoticon":"","ad_info":"","mid":"4722363411727060","realpos":1,"topic_flag":1,"channel_type":"","fun_word":0,"subject_label":"","rank":0}下次，用的时候从文本中读取用的时候使用r.json,也就是用json对象
realTimeContent = r.json()['data']['realtime']json 数据传回前端往往需要
with open('D:/Temp/hot_search_ranking/data/data.json','r',encoding='utf-8') as fp:
r = fp.read()#读json文件
r = json.loads(r)['data']['realtime']#转json对象
r = json.dumps(r)#转json文本，和json对象一模一样，不是json字符形式，它的键没有双引号，这是传输不能直接传json对象的才传文本的缘故
return r这样传输的是二进制文本
代码语言：javascript复制/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
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*/json遍历
下面的遍历优点在于不需要知道key具体是什么
代码语言：javascript复制//原生js遍历JSON
$.ajax({
type: "GET",
dataType: "json",
url: "/data",
//data: { id: id, name: name },
success: function(json) {
for(var i=0;i<json.length;i ){
for(var key in json[i]){
alert(key ':' json[i][key]);
}
}
},
error: function(json) {
}
});//jQuery遍历JSON
var json_1 = {"name":"jim","age":"28"};
$.each(json_1,function(key,value){ //其中key是json的key，value指相对应的值;
console.log(key " : " value);
})清洗
新手，hhh，我就把没必要的键值对扔了。
代码语言：javascript复制 //清洗
for(var i=0;i<json.length;i ){
delete json[i]['is_new'];
delete json[i]['star_word'];
delete json[i]['word'];
delete json[i]['realpos'];
delete json[i]['flag'];
delete json[i]['raw_hot'];
delete json[i]['emoticon'];
delete json[i]['subject_label'];
delete json[i]['icon_desc_color'];
delete json[i]['flag_desc'];
delete json[i]['subject_querys'];
delete json[i]['ad_info'];
delete json[i]['topic_flag'];
delete json[i]['fun_word'];
delete json[i]['icon_desc'];
}
