拖动模态框

<!DOCTYPE html>
<html lang="zh">
<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>拖动模态框</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
        
        #box{
            position: relative;
            width: 596px;
            height: 396px;
            background-color: pink;
            border: 2px solid #333;
            margin: 100px auto;
        }
        #titl{
            position: absolute;
            width: 100%;
            height: 60px;
            background-color:  orange;
            color: #333333;
            font-size: 26px;
            line-height: 60px;
            text-align: center;
            font-weight: 700;
        }
        #tex{
            position: absolute;
            width: 100%;
            height: 336px;
            top: 60px;
            /*background-color: olive;*/
            font-size: 18px;
        }
        #tex ul li{
            width: 560px;
            height: 70px;
            /*background-color: palegreen;*/
            line-height: 70px;
            margin-top: 40px;
            list-style-type: none;
            margin-left: 20px;
        }
        #tex input{
            width: 400px;
            height: 40px;
        }
    </style>
</head>
<body>
    <div id="box">
        <div id="titl">
            用户登录
        </div>
        <div id="tex">
            <ul>
                <li>用户名：<input type="text" id="ipt1"  placeholder="输入用户名"/> </li>
                <li>密  &nbsp;  码：<input type="password" id="ipt2"  placeholder="输入密码"/></li>
            </ul>
        </div>
    </div>
    <script type="text/javascript">
        var titl=document.getElementById('titl');
        var box=document.getElementById('box')
//        鼠标按下时,获取鼠标在盒子内的坐标
        titl.addEventListener('mousedown',function(e){
             var boxLeft=box.offsetLeft;   //盒子距离左侧外层边框的距离
//             console.log(titlLeft)
            var    boxTop=box.offsetTop;   //盒子距离上面外层边框的距离
            var eLeft=e.pageX;        //鼠标距离最左边
            var eTop=e.pageY;        //鼠标距离最上边
            var Le=eLeft-boxLeft;   //鼠标距离盒子左边缘的距离
            var Te=eTop-boxTop;
            
//            随时赋值
            document.addEventListener('mousemove',move)
            function move(e){
                box.style.marginLeft=e.pageX-Le+'px'
                box.style.marginTop=e.pageY-Te+'px'
            }
            
            document.addEventListener('mouseup',function(){
                document.removeEventListener('mousemove',move)
            })
        })
        
    </script>
</body>
</html>
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