javascript实现移动端触屏拖拽功能

网络编程 2024/12/23 佚名

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本文实例为大家分享了javascript实现移动端触屏拖拽的具体代码，供大家参考，具体内容如下

HTML:

<body>
   <div id="div1">
   </div>
</body>

CSS:

<style media="screen">
    * {
      margin: 0;
      padding: 0;
    }
    html,body {
      width: 100%;
      height:100%;
    }
    #div1 {
      width: 50px;
      height: 50px;
      background: cyan;
      position: absolute;
    }
</style>

JS:

<script type="text/javascript">
     var div1=document.querySelector('#div1');
     var maxW=document.body.clientWidth-div1.offsetWidth;
     var maxH=document.body.clientHeight-div1.offsetHeight;
 
  div1.addEventListener('touchstart',function(e){
    var ev = e || window.event;
    var touch = ev.targetTouches[0];
    oL = touch.clientX - div1.offsetLeft;
    oT = touch.clientY - div1.offsetTop;
    document.addEventListener("touchmove",defaultEvent,false);
  })
 
 
  div1.addEventListener('touchmove',function(e){
    var ev = e || window.event;
    var touch = ev.targetTouches[0];
    var oLeft = touch.clientX - oL;
    var oTop = touch.clientY - oT;
    if(oLeft<0){
      oLeft=0;
    }else if (oLeft>=maxW) {
      oLeft=maxW;
    }
    if(oTop<0){
      oTop=0;
    }else if (oTop>=maxH) {
      oTop=maxH;
    }
 
    div1.style.left = oLeft + 'px';
    div1.style.top = oTop + 'px';
 
  })
  div1.addEventListener('touchend',function(){ 
    document.removeEventListener("touchmove",defaultEvent);
  })
  function defaultEvent(e) {
 
 
    e.preventDefault();
   }
</script>

说明 :

maxW:div1可移动的最大宽度
maxH:div1可移动的最大高度
oL、oT:鼠标所点位置的坐标

效果: