分析

1.点击弹出框，状态框和遮挡层（背景变灰）就会显示出来 display：block；

2.点击关闭按钮，模态框和遮挡层就会隐藏起来 display：none;

3.在页面中拖拽的原理：鼠标按下并且移动，之后松开鼠标

4.触发事件是鼠标按下mousedown，鼠标移动mousemove，鼠标松开mouseup

5.推拽过程：鼠标移动过程中，获得最新的值赋给模态框的left和top值，这样模态框就可以跟着鼠标走了

6.鼠标按下出发的事件源是最上面一行，就是id为title

7.鼠标的坐标减去鼠标在盒子内的坐标，才是真正模态框的位置

8.鼠标按下，我们要得到鼠标在盒子的坐标

9.鼠标移动，就让模态框的坐标设置为：鼠标坐标减去盒子坐标即可，注意移动事件写到按下事件里面

10.鼠标松开，就是停止拖拽，就是可以让鼠标移动事件解除

代码

<!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>        .login-header {            width: 100%;            text-align: center;            height: 30px;            font-size: 24px;            line-height: 30px;        }                * {            padding: 0;            margin: 0;        }                .login {            display: none;            width: 512px;            height: 280px;            position: fixed;            border: #ebebeb solid 1px;            left: 50%;            top: 50%;            background: #ffffff;            box-shadow: 0px 0px 20px #ddd;            z-index: 9999;            transform: translate(-50%, -50%);        }                .login-title {            width: 100%;            margin: 10px 0px 0px 0px;            text-align: center;            line-height: 40px;            height: 40px;            font-size: 18px;            position: relative;            cursor: move;        }                .login-input-content {            margin-top: 20px;        }                .login-button {            width: 50%;            margin: 30px auto 0px auto;            line-height: 40px;            font-size: 14px;            border: #ebebeb 1px solid;            text-align: center;        }                .login-bg {            display: none;            width: 100%;            height: 100%;            position: fixed;            top: 0px;            left: 0px;            background: rgba(0, 0, 0, .3);        }                a {            text-decoration: none;            color: #000000;        }                .login-button a {            display: block;        }                .login-input input.list-input {            float: left;            line-height: 35px;            height: 35px;            width: 350px;            border: #ebebeb 1px solid;            text-indent: 5px;        }                .login-input {            overflow: hidden;            margin: 0px 0px 20px 0px;        }                .login-input label {            float: left;            width: 90px;            padding-right: 10px;            text-align: right;            line-height: 35px;            height: 35px;            font-size: 14px;        }                .login-title span {            position: absolute;            font-size: 12px;            right: -20px;            top: -30px;            background: #ffffff;            border: #ebebeb solid 1px;            width: 40px;            height: 40px;            border-radius: 20px;        }    </style></head><body>    <div class="login-header"><a id="link" href="javascript:;">点击，弹出登录框</a></div>    <div id="login" class="login">        <div id="title" class="login-title">登录会员            <span><a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a></span>        </div>        <div class="login-input-content">            <div class="login-input">                <label>用户名：</label>                <input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">            </div>            <div class="login-input">                <label>登录密码：</label>                <input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">            </div>        </div>        <div id="loginBtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>    </div>    <!-- 遮盖层 -->    <div id="bg" class="login-bg"></div>    <script>        var link = document.querySelector('#link'); //获取我们鼠标点击的对象        var login = document.querySelector('.login'); //获得弹出框元素        var mask = document.querySelector('#bg');        var closeBtn = document.querySelector('#closeBtn');        link.addEventListener('click', function() {            login.style.display = 'block';            mask.style.display = 'block';        })        closeBtn.addEventListener('click', function() {            login.style.display = 'none';            mask.style.display = 'none';        })        var title = document.querySelector('#title');        title.addEventListener('mousedown', function(e) {            var x = e.pageX - login.offsetLeft;            var y = e.pageY - login.offsetTop;            console.log(y);            document.addEventListener('mousemove', move)            function move(e) {                login.style.left = e.pageX - x + 'px';                login.style.top = e.pageY - y + 'px';            }            document.addEventListener('mouseup', function() {                document.removeEventListener('mousemove', move);            })        })    </script></body></html>

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