点击登录显示蒙版

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .mengban {
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            position: absolute;
            top: 0;
            left: 0;
            display: none;
            z-index: 2;
        }

        .login {
            width: 500px;
            height: 300px;
            background: #fff;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top: -150px;
            margin-left: -250px;
            text-align: center;
            padding: 5px;
            font-size: 30px;
            box-sizing: border-box;
            color: #000;
            display: none;
            border-radius:5px;
            z-index: 3;
        }

        .close {
            float: right;
            color: #000;
            margin-right:10px;
            font-size: 30px;
            cursor: pointer;
        }

    </style>
</head>
<body>
<div id="btn" style="cursor: pointer;">
    登录
</div>
<div class="mengban" id="MB"></div>
<div class="login" id="DL">
    <div style="margin-top:30px;display: inline-block;">
        欢迎登录
    </div>
    <div class="close" id="cls">×</div>
</div>

<script>
    var denglu = document.getElementById("btn");
    var cls = document.getElementById("cls");
    var mb = document.getElementById("MB");
    var dl = document.getElementById("DL");

    denglu.onclick = function () {
        mb.style.display = "block";
        dl.style.display = "block";
    }
    cls.onclick = function () {
        mb.style.display = "none";
        dl.style.display = "none";
    }
</script>

</body>
</html>
点击登录显示蒙版

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