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vue中手机移动端用户如何通过触屏进行拖放操作?

请问vue中手机移动端用户如何通过触屏进行拖放操作?

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手机端拖动事件是touchstart touchmove touchend,对用pc端的mousedown mousemove mouseup事件,下面实现了一个兼容手机端和pc端的vue拖放代码:

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
    <style>
        .xuanfu {
        height: 4.5rem;
        width: 4.5rem;
        z-index: 990;
        position: fixed;
        top: 4.2rem;
        right: 3.2rem;
        border-radius: 0.8rem;
        background-color: rgba(0, 0, 0, 0.55);
      }
      .yuanqiu {
        height: 2.7rem;
        width: 2.7rem;
        border: 0.3rem solid rgba(140, 136, 136, 0.5);
        margin: 0.65rem auto;
        color: #000000;
        font-size: 1.6rem;
        line-height: 2.7rem;
        text-align: center;
        border-radius: 100%;
        background-color: #ffffff;
      }
    </style>
</head>

<body>
    <div id="app">
        <div id="customer">

            <!-- Suspended HTML -->
            <div ref="moveDiv" class="xuanfu" id="div2" @mousedown="down" @touchstart="down" @mousemove="move" @touchmove="move" @mouseup="end" @touchend="end">
                <div class="yuanqiu">

                </div>
            </div>

        </div>

        <script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/vue.2.2.min.js"></script>


        <script>
            new Vue({
                    el: '#app',
                data:function() {
                    return {
    flags: false,
    position: {
      x: 0,
      y: 0
    },
    nx: '', ny: '', dx: '', dy: '', xPum: '', yPum: '',
  }
                },
        
        
              methods: {
  // Mobile drag
  down(){
    this.flags = true;
    var touch ;
    if(event.touches){
        touch = event.touches[0];
    }else {
        touch = event;
    }
    this.position.x = touch.clientX;
    this.position.y = touch.clientY;
    this.dx =  this.$refs.moveDiv.offsetLeft;
    this.dy =  this.$refs.moveDiv.offsetTop;
  },
  move(){
    if(this.flags){
      var touch ;
      if(event.touches){
          touch = event.touches[0];
      }else {
          touch = event;
      }
      this.nx = touch.clientX - this.position.x;
      this.ny = touch.clientY - this.position.y;
      this.xPum = this.dx+this.nx;
      this.yPum = this.dy+this.ny;
      this.$refs.moveDiv.style.left = this.xPum+"px";
       this.$refs.moveDiv.style.top = this.yPum +"px";
      //Prevent page from sliding default events
      document.addEventListener("touchmove",function(){
          event.preventDefault();
      },false);
    }
  },
//Function when mouse is released
  end(){
    this.flags = false;
  },
}
        
            })
        </script>
</body>

</html>

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