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实现JS拖动效果的简单方法

小云云asal: 2018-03-31 16:53:202047semak imbas

本文主要和大家分享实现JS拖动效果的简单方法，利用CSS3的Trnsform的移动属性来实现的，希望能帮助到大家。

代码如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
      #dom{
          width: 50px;
          height: 50px;
          border: 2px solid red;
      }
    </style>
</head>
<body>
    <p id="dom"></p>
    <script>

        (function(){
            let dom = document.getElementById(&#39;dom&#39;);
            let moveX,moveY
            dom.addEventListener(&#39;mousedown&#39;,function (e) { 
                moveX=e.target.offsetWidth;
                moveY=e.target.offsetHeight
                console.log(e);
                document.addEventListener(&#39;mousemove&#39;,move,false)
                
            })
            function move(e){
                if(moveY&& moveY){
                    let width =moveX/2,height = width+moveY;
                    dom.style.transform=&#39;translate(&#39;+(e.x-width)+&#39;px,&#39;+(e.y-height)+&#39;px)&#39;
                }
            }
            document.addEventListener(&#39;mousemove&#39;,move,false)
            document.addEventListener(&#39;mouseup&#39;,function (e) {
                let width =moveX/2,height = width+moveY;
                let i =(e.x-width) +&#39;px&#39;,y=(e.y-height)+&#39;px&#39;;
              
                if(moveX && moveY){
                    document.removeEventListener(&#39;mousemove&#39;,move,false);
                    dom.style.transform=&#39;translate(&#39;+i+&#39;,&#39;+y+&#39;)&#39;;
                    moveY=&#39;&#39;,moveX=&#39;&#39;
                }
                
            })
        })()
    
    
    </script>
</body>
</html>

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