vue中实现拖动调整左右两侧div的宽度

// template

<div class="box" ref="box">
  <div class="left">
    <!--左侧div内容-->
  </div>
  <div class="resize" title="收缩侧边栏">
    ⋮
  </div>
  <div class="mid">
    <!--右侧div内容-->
  </div>
</div>

// script

methods:{
  dragControllerDiv () {
    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) {
            //颜色改变提醒
            resize[i].style.background = '#818181';
            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 < 32) moveLen = 32; // 左边区域的最小宽度为32px
                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) {
                //颜色恢复
                resize[i].style.background = '#d6d6d6';
                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;
        };
    }
  }
},
mouted(){
  this.dragControllerDiv()
}

// style

/* 拖拽相关样式 */
.box {
  width: 100%;
  height: 100%;
  margin: 1% 0px;
  overflow: hidden;
  box-shadow: -1px 9px 10px 3px rgba(0, 0, 0, 0.11);
}

.left {
  width: calc(32% - 10px);
  /*左侧初始化宽度*/
  height: 100%;
  background: #FFFFFF;
  float: left;
}

.resize {
  cursor: col-resize;
  float: left;
  position: relative;
  top: 45%;
  background-color: #d6d6d6;
  border-radius: 5px;
  margin-top: -10px;
  width: 10px;
  height: 50px;
  background-size: cover;
  background-position: center;
  /*z-index: 99999;*/
  font-size: 32px;
  color: white;
}

.resize:hover {
  color: #444444;
}

.mid {
  float: left;
  width: 68%;
  /*右侧初始化宽度*/
  height: 100%;
  background: #fff;
  box-shadow: -1px 4px 5px 3px rgba(0, 0, 0, 0.11);
}