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Simple implementation of JS drag effect

不言Original: 2018-03-31 13:36:231110browse

This article shares with you the code for simply realizing the JS drag effect, which is implemented using the mobile attribute of Trnsform of CSS3. Friends in need can take a look at the content of this article

Achieved by using the mobile attribute of CSS3 Trnsform.

The code is as follows

<!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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