模态框小实例

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>模态框-留言板</title>
</head>
<style>
    *{
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    .notes{
        width: 100px;
        height: 100px;
        background-color: coral;
        position: fixed;
        top: 200px;
        right: 0;
        text-align: center;
        line-height: 100px;
        color: #fff;
    }
    /* 遮罩层 */
    .modal .modal-bg{
        position: fixed;
        /* 坐标全部清0,请定位到四个顶点 */
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: rgb(0,0,0,.5);
    }
    /* 弹出层模态框 */
    /* 定位 */
    .modal .modal-form {
        position: fixed;
        top: 10em;
        left: 28em;
        right: 28em;
    }
    .modal .modal-form fieldset {
        height: 22em;
        background-color: lightcyan;
        border: none;
        padding: 2em 3em;
        box-shadow: 0 0 5px #888;
    }
    .modal .modal-form fieldset legend{
        color: #fff;
        background-color: coral;
        padding: 8px 2em;
    }
    .modal .modal-form fieldset textarea{
        width:45em;    
        outline: none;
        border: 1px solid #ddd;
        font-size: 14px;
        margin-top: 8px;
    }
    .modal .modal-form fieldset input{
        width:22em;    
        outline: none;
        border: 1px solid #ddd;
        font-size: 14px;
        margin-top: 8px;
        height: 30px;
        margin-left: 8px;
    }
    .modal .modal-form fieldset button{
        width: 14em;
        margin-left: 10px;      
        outline: none;
        border: 1px solid #ddd;
        height: 30px;
        background-color: coral; 
        cursor: pointer;
        color: #fff;
    }
    .modal{
        display: none;
    }
</style>
<script>
    //显示模态框
    function showModal(){
        //获取模态框元素
        const modal = document.querySelector('.modal');
        //显示模态框
        modal.style.display = 'block';
        //焦点自动置入第一个文本域
        modal.querySelector('textarea').focus();
    }
    //关闭模态框
    function closeModal(){
         //获取模态框元素
         const modal = document.querySelector('.modal');
         //关闭模态框
        modal.style.display = 'none';         
    }
</script>
<body>
    <div class="notes" onclick="showModal()">点我留言</div>
    <!-- 模态框 -->
    <div class="modal">
        <!-- 模态框遮罩层 -->
        <div class="modal-bg" onclick="closeModal()"></div>
        <!-- 弹出层 -->
        <div class="modal-form">
            <fieldset>
                <legend>市长信箱</legend>
                <label for="your-notes">您的留言:</label><textarea name="notes" id="your-notes" cols="30" rows="10" placeholder="请输入您的留言"></textarea>
                <label for="your-email">您的邮箱:</label><input type="email" name="email" id="your-email" placeholder="请输入您的邮箱如：123@com">
                <button>提  交</button>
            </fieldset>
        </div>
    </div>
</body>
</html>
模态框实例
模态框小实例

模态框小实例

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