需求效果：
原理：拖动效果的实现基本都是dom操作来实现的，通过拖动分隔线，计算分隔线与浏览器边框的距离(left)，来实现拖动之后的不同宽度的计算；当拖动分隔线1时，计算元素框left和mid；当拖动分隔线2时，计算元素框mid和right；同时设置元素框最小值以防止元素框拖没了（其实是被遮住了）。使用SetCapture() 和 ReleaseCapture()的函数功能指定窗口里设置鼠标捕获。
在vuejs中使用，methods设置方法，mounted钩子挂载：
html部分代码：
<template> <div> <ul ref="box"> <li ref="left">西瓜</li> <li ref="resize"></li> <li ref="mid">备注2</li> <li ref="resize2"></li> <li ref="right">test</li> </ul> <ul ref="box"> <li ref="left">芒果</li> <li ref="resize"></li> <li ref="mid">备注</li> <li ref="resize2"></li> <li ref="right">test</li> </ul> </div> </template>
js部分代码
<script> export default { mounted () { this.dragControllerDiv(); }, methods: { dragControllerDiv: function () { var resize = document.getElementsByClassName('resize'); var resize2 = document.getElementsByClassName('resize2'); var left = document.getElementsByClassName('left'); var right = document.getElementsByClassName('right'); var mid = document.getElementsByClassName('mid'); var box = document.getElementsByClassName('box'); for (let i = 0; i < resize.length; i++) { resize[i].onmousedown = function (e) { var startX = e.clientX; resize[i].left = resize[i].offsetLeft; document.onmousemove = function (e) { var endX = e.clientX; var rightW = right[i].offsetWidth; var moveLen = resize[i].left + (endX - startX); var maxT = box[i].clientWidth - resize[i].offsetWidth; if (moveLen < 150) moveLen = 150; if (moveLen > maxT - rightW - 150) moveLen = maxT - rightW - 150; resize[i].style.left = moveLen; for (let j = 0; j < left.length; j++) { left[j].style.width = moveLen + 'px'; mid[j].style.width = (box[i].clientWidth - moveLen - rightW - 10) + 'px'; } } document.onmouseup = function (evt) { document.onmousemove = null; document.onmouseup = null; resize[i].releaseCapture && resize[i].releaseCapture(); } resize[i].setCapture && resize[i].setCapture(); return false; } } for (let i = 0; i < resize2.length; i++) { resize2[i].onmousedown = function (e) { var startX = e.clientX; resize2[i].left = resize2[i].offsetLeft; document.onmousemove = function (e) { var endX = e.clientX; var leftW = left[i].offsetWidth; var moveLen = resize2[i].left + (endX - startX) - leftW; var maxT = box[i].clientWidth - resize2[i].offsetWidth - 5; if (moveLen < 150) moveLen = 150; if (moveLen > maxT - leftW - 150) moveLen = maxT - leftW - 150; resize2[i].style.left = moveLen; for (let j = 0; j < right.length; j++) { mid[j].style.width = moveLen + 'px'; right[j].style.width = (box[i].clientWidth - moveLen - leftW - 10) + 'px'; } } document.onmouseup = function (evt) { document.onmousemove = null; document.onmouseup = null; resize2[i].releaseCapture && resize2[i].releaseCapture(); } resize2[i].setCapture && resize2[i].setCapture(); return false; } } } } } </script>广州VI设计公司https://www.houdianzi.com
style部分
<style scoped> ul,li{ list-style: none; display: block; margin:0; padding:0; } .box{ width:800px; height:32px; overflow:hidden; } .left{ width:calc(30% - 10px); height:100%; background:skyblue; float:left; } .resize{ width:5px; height:100%; cursor: w-resize; float:left; } .resize2{ width:5px; height:100%; cursor: w-resize; float:left; } .right{ float:left; width:35%; height:100%; background:tomato; } .mid{ float:left; width:35%; height:100%; background:#f00; } </style>