先上效果图：
废话不多说了 直接上代码吧...
很简单的 就是一些原生操作
代码语言：javascript复制<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<style>
.drapDom {
width: 500px;
height: 500px;
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
background: sandybrown;
border-radius: 50px;
}
.drapDom_header {
width: 100%;
background: sienna;
height: 50px;
border-radius: 50px;
text-align: center;
line-height: 50px;
color: wheat;
font-size: 30px;
}
</style>
<body>
<h1>原生dom拖拽移动位置</h1>
<hr />
<div class="drapDom">
<div class="drapDom_header">拖着我走</div>
</div>
<script>
const dialogHeaderEl = document.querySelector(".drapDom_header");
const dragDom = document.querySelector(".drapDom");
//dialogHeaderEl.style.cursor = 'move';
dialogHeaderEl.style.cssText = ";cursor:move;";
dragDom.style.cssText = ";top:0px;";
// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const sty = (function () {
if (window.document.currentStyle) {
return (dom, attr) => dom.currentStyle[attr];
} else {
return (dom, attr) => getComputedStyle(dom, false)[attr];
}
})();
dialogHeaderEl.onmousedown = (e) => {
// 鼠标按下，计算当前元素距离可视区的距离
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
const screenWidth = document.body.clientWidth; // body当前宽度
const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
const dragDomheight = dragDom.offsetHeight; // 对话框高度
const minDragDomLeft = dragDom.offsetLeft;
const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
const minDragDomTop = dragDom.offsetTop;
const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
// 获取到的值带px 正则匹配替换
let styL = sty(dragDom, "left");
let styT = sty(dragDom, "top");
// 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
if (styL.includes("%")) {
styL = document.body.clientWidth * ( styL.replace(/%/g, "") / 100);
styT = document.body.clientHeight * ( styT.replace(/%/g, "") / 100);
} else {
styL = styL.replace(/px/g, "");
styT = styT.replace(/px/g, "");
}
document.onmousemove = function (e) {
// 通过事件委托，计算移动的距离
let left = e.clientX - disX;
let top = e.clientY - disY;
// 边界处理
if (-left > minDragDomLeft) {
left = -minDragDomLeft;
} else if (left > maxDragDomLeft) {
left = maxDragDomLeft;
}
if (-top > minDragDomTop) {
top = -minDragDomTop;
} else if (top > maxDragDomTop) {
top = maxDragDomTop;
}
// 移动当前元素
dragDom.style.cssText = `;left:${left styL}px;top:${
top styT
}px;`;
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
</script>
</body>
</html>
