点击弹出模态框-以登录表单为例

模态框效果，模态框展示登录或注册表单，就不用再跳转到login.html。只需点击一下按钮弹出登录表单即可。3个效果，点击弹出，右上角的×号，和点击左下角的cancel按钮。

登录表单

代码如下

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>
    /* Full-width input fields */
    input[type=text], input[type=password] {
        width: 100%;
        padding: 12px 20px;
        margin: 8px 0;
        display: inline-block;
        border: 1px solid #ccc;
        box-sizing: border-box;
    }

    /* Set a style for all buttons */
    button {
        background-color: #4CAF50;
        color: white;
        padding: 14px 20px;
        margin: 8px 0;
        border: none;
        cursor: pointer;
        width: 100%;
    }

    button:hover {
        opacity: 0.8;
    }

    /* Extra styles for the cancel button */
    .cancelbtn {
        width: auto;
        padding: 10px 18px;
        background-color: #f44336;
    }

    /* Center the image and position the close button */
    .imgcontainer {
        text-align: center;
        margin: 24px 0 12px 0;
        position: relative;
    }

    img.avatar {
        width: 40%;
        border-radius: 50%;
    }

    .container {
        padding: 16px;
    }

    span.psw {
        float: right;
        padding-top: 16px;
    }

    /* The Modal (background) */
    .modal {
        display: none; /* Hidden by default */
        position: fixed; /* Stay in place */
        z-index: 1; /* Sit on top */
        left: 0;
        top: 0;
        width: 100%; /* Full width */
        height: 100%; /* Full height */
        overflow: auto; /* Enable scroll if needed */
        background-color: rgb(0,0,0); /* Fallback color */
        background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
        padding-top: 60px;
    }

    /* Modal Content/Box */
    .modal-content {
        background-color: #fefefe;
        margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
        border: 1px solid #888;
         80%; /* Could be more or less, depending on screen size */
    }

    /* The Close Button (x) */
    .close {
        position: absolute;
        right: 25px;
        top: 0;
        color: #000;
        font-size: 35px;
        font-weight: bold;
    }

    .close:hover,
    .close:focus {
        color: red;
        cursor: pointer;
    }

    /* Add Zoom Animation */
    .animate {
        -webkit-animation: animatezoom 0.6s;
        animation: animatezoom 0.6s
    }

    @-webkit-keyframes animatezoom {
        from {-webkit-transform: scale(0)}
        to {-webkit-transform: scale(1)}
    }

    @keyframes animatezoom {
        from {transform: scale(0)}
        to {transform: scale(1)}
    }

    /* Change styles for span and cancel button on extra small screens */
    @media screen and (max- 300px) {
        span.psw {
            display: block;
            float: none;
        }
        .cancelbtn {
            width: 100%;
        }
    }
</style>
<body>
<h2>登录表单</h2>

<button onclick="document.getElementById('id01').style.display='block'" style="auto;">登录</button>

<div id="id01" class="modal">
　　　　

　　
    <form class="modal-content animate" action="/action_page.php">
        <div class="imgcontainer">
            <!-- 点击×号，隐藏模态框-->
            <span onclick="document.getElementById('id01').style.display='none'" class="close" title="Close Modal">&times;</span>
            <img src="https://static.runoob.com/images/mix/img_avatar.png" alt="Avatar" class="avatar">
        </div>

        <div class="container">
            <label><b>Username</b></label>
            <input type="text" placeholder="Enter Username" name="uname" required>

            <label><b>Password</b></label>
            <input type="password" placeholder="Enter Password" name="psw" required>

            <button type="submit">登陆</button>
            <input type="checkbox" checked="checked"> 记住我
        </div>

        <div class="container" style="background-color:#f1f1f1">
            <!-- 点击cancel按钮，把模态框隐藏-->
            <button type="button" onclick="document.getElementById('id01').style.display='none'" class="cancelbtn">Cancel</button>
            <span class="psw">Forgot <a href="#">password?</a></span>
        </div>
    </form>
</div>
</body>
</html>

<script>
    // 获取模型
    var modal = document.getElementById('id01');

    // 鼠标点击模型外区域关闭登录框
    window.onclick = function(event) {
        if (event.target == modal) {
            modal.style.display = "none";
        }
    }
</script>

模态框（model-content）有3个div组成，如图红、蓝‘、绿。