vue 拖动调整左右两侧div的宽度

原文链接：https://www.cnblogs.com/layaling/p/11009570.html

原文是左中右三种情况的拖动。由于项目需要，我删除掉了右边的，直接左右区域拖动调整div宽度

1、拖动，调整左右两侧宽度

<template>
  <div class="wid100 hig100">
    <ul class="box" ref="box">
      <li class="left" ref="left">西瓜</li>
      <li class="resize" ref="resize"></li>
      <li class="mid" ref="mid">备注2</li>
    </ul>
    <ul class="box" ref="box">
      <li class="left" ref="left">西瓜</li>
      <li class="resize" ref="resize"></li>
      <li class="mid" ref="mid">备注2</li>
    </ul>
  </div>
</template>

<script>
  export default {
    name: 'Dashboard',
    mounted () {
      this.dragControllerDiv();
    },
    methods: {
      dragControllerDiv: function () {
        var resize = document.getElementsByClassName('resize');
        var left = document.getElementsByClassName('left');
        var mid = document.getElementsByClassName('mid');
        var box = document.getElementsByClassName('box');
        for (let i = 0; i < resize.length; i++) {
          // 鼠标按下事件
          resize[i].onmousedown = function (e) {
            var startX = e.clientX;
            resize[i].left = resize[i].offsetLeft;
            // 鼠标拖动事件
            document.onmousemove = function (e) {
              var endX = e.clientX;
              var moveLen = resize[i].left + (endX - startX); // （endx-startx）=移动的距离。resize[i].left+移动的距离=左边区域最后的宽度
              var maxT = box[i].clientWidth - resize[i].offsetWidth;  // 容器宽度 - 左边区域的宽度 = 右边区域的宽度

              if (moveLen < 150) moveLen = 150; // 左边区域的最小宽度为150px
              if (moveLen > maxT - 150) moveLen = maxT  - 150;  //右边区域最小宽度为150px

              resize[i].style.left = moveLen; // 设置左侧区域的宽度

              for (let j = 0; j < left.length; j++) {
                left[j].style.width = moveLen + 'px';
                mid[j].style.width = (box[i].clientWidth - moveLen - 10) + 'px';
              }
            }
            // 鼠标松开事件
            document.onmouseup = function (evt) {
              document.onmousemove = null;
              document.onmouseup = null;
              resize[i].releaseCapture && resize[i].releaseCapture(); //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
            }
            resize[i].setCapture && resize[i].setCapture(); //该函数在属于当前线程的指定窗口里设置鼠标捕获
            return false;
          }
        }

      }
    }
  }
</script>

<style lang="scss" scoped>
  ul,li{
    list-style: none;
    display: block;
    margin:0;
    padding:0;
  }
  .box{
    width:100%;
    height: 48%;
    margin: 1% 0px;
    overflow:hidden;
  }
  .left{
    width:calc(30% - 10px);
    height:100%;
    background:#c9c9c9;
    float:left;
  }
  .resize{
    width:5px;
    height:100%;
    cursor: w-resize;
    float:left;
  }
  .mid{
    float:left;
    width:70%;
    height:100%;
    background:#f3f3f3;
  }
</style>