Web实现：伪类事件伪类搜索框获得焦点后出现下拉框-CFANZ编程社区

Web实现：伪类事件伪类搜索框获得焦点后出现下拉框

Web实现：鼠标在搜索框悬停时有边框变色的效果，获取焦点之后出现下拉框。
HTML部分代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>练习</title>
    <link rel="stylesheet" href="index.css" type="text/css" media="all" />
</head>

<body>
    <div class="search-box">
        <input type="text" value="红米k20">
        <div class="select-list">
            <ul>
                <li>小米9</li>
                <li>Redmi K20 pro</li>
                <li>Redmi K20 </li>
                <li>Redmi note 7 Pro </li>
                <li>Redmi note 7</li>
                <li>小米电视4c</li>
                <li>电视32英寸</li>
                <li>笔记本Pro</li>
                <li>小爱音箱</li>
                <li>净水器</li>
            </ul>
        </div>
        <div class="search-btn">
            <span></span>
        </div>

    </div>
</body>

</html>

CSS部分代码：

body {
    margin: 0;
    background-color: #fff;
}

ul,
li {
    margin: 0px;
    padding: 0px;
    list-style: none;
}

.search-box {
    position: relative;
    box-sizing: border-box;
    width: 254px;
    height: 42px;
    background: #FFFFFF;
    border: 1px solid #E0E0E0;
}

.search-box>input {
    box-sizing: border-box;
    float: left;
    border: none;
    height: 40px;
    width: 209px;
    padding-left: 20px;
    outline: none;
    font-style: normal;
    font-weight: normal;
    font-size: 12px;
    line-height: 17px;
    color: #AEAEAE;
}

.search-box .search-btn {
    float: right;
    height: 42px;
    width: 42px;
    border: 1px solid #E0E0E0;
    box-sizing: border-box;
    margin-top: -1px;
    margin-right: -1px;
    padding: 12px;
}

.search-box>div>span {
    display: block;
    width: 16px;
    height: 16px;
    background: url(./images/search-normal.png) no-repeat center;
    background-size: contain;
}

.search-box .select-list {
    position: absolute;
    top: 40px;
    left: -1px;
    width: 213px;
    height: 282px;
    background: #FFFFFF;
    border: 1px solid #FD6821;
    box-sizing: border-box;
    display: none;
}

.search-box .select-list li {
    height: 28px;
    font-weight: normal;
    font-size: 12px;
    color: #000000;
    padding-left: 15px;
    line-height: 28px;
}


.search-box:hover {
    border: 1px solid #FD6821;
}

.search-box:hover .search-btn {
    border: 1px solid #FD6821;
}

.search-box input:focus+.select-list {
    display: block;
}

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