拖拽 

<!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 type="text/css">
        #info {
            width: 100px;
            height: 100px;
            background-color: red;
            border-radius: 50%;
            position: absolute;
        }
    </style>
</head>
<body>
        <div id="info"></div>
</body>
<script>
class  fn{
    constructor(dom){
        this.dom=dom
    }
    drag(){
        this.dom.onmousedown = function(env){
            console.log(this)
                var env = env || window.event;
                var disX = env.offsetX;
                var disY = env.offsetY;
                var that = this; 
                document.onmousemove = function(env){
                    console.log(this)
                    var env = env || window.event;
                    var L = env.clientX - disX;
                    var T = env.clientY - disY;
                    that.style.left = L + 'px';
                    that.style.top = T + 'px';
                }

                document.onmouseup = function (){
                    console.log(this)
                    document.onmousemove = null;
                }

            }
    }
}

let a=new fn(document.getElementById('info'))
a.drag()
</script>
</html>

这是拖拽哦

posted @ 2019-11-19 11:36  黄瓜-表示不服  阅读(143)  评论(1)    收藏  举报