批改状态:合格
老师批语:选择器很规范
<style>/* 初始化 */* {margin: 0;padding: 0;box-sizing: border-box;}a {text-decoration: none;color: #333;}body {/* 将body转为弹性盒子 */display: flex;/* 确定盒子主轴方向,是否换行。column:主轴方向垂直;row:主轴方向水平;nowrap:不换行 */flex-flow: column nowrap;/* 整个页面在浏览器窗口中水平居中对齐 *//* width: 1000px;margin: auto; */}/* 设置网站顶部、底部样式 */header,footer {height: 60px;background-color: #ddd;}/* 将header、footer转为弹性盒子 */header {display: flex;/* 水平居中对齐 *//* justify-content: center; *//* 垂直居中对齐 */align-items: center;font-size: 16px;font-weight: 700;}header > a {/* flex是flex-grow,flex-shrink,flex-basis的简写;默认值:0 1 auto;(表示禁止放大,可以收缩,项目原始大小自适应) 后来两个属性可选 */flex: 0 1 120px;/* 文本水平居中 */text-align: center;}/* 除第一个a标签以外的所有a标签的悬停状态 */header > a:hover:not(:first-of-type) {color: #f00;}/* 设置第一个a标签(LOGO)与导航栏目的右边距 */header > a:first-of-type {margin-right: 40px;}/* 设置最后一个a标签(客服)始终在网站右侧 */header > a:last-of-type {margin-left: auto;font-size: 14px;color: #666;font-weight: normal;}/* 将footer转为弹性盒子 */footer {display: flex;justify-content: center;align-items: center;}/* 将container转为弹性盒子 */.container {display: flex;/* 两端对齐 */justify-content: space-between;min-height: 400px;}.container > div {background-color: aquamarine;flex: 0 1 200px;}.container > .center {background-color: burlywood;flex: 0 1 600px;}/* 媒体查询 */@media (max-width: 992px) {.container > .right {display: none;}}@media (max-width: 768px) {header > a:last-of-type,header > a:nth-of-type(5),header > a:nth-of-type(6) {/* 隐藏 */display: none;}header > a:not(:first-of-type) {font-size: 12px;flex: 0 1 80px;}}</style><body><header><a href="">LOGO</a><a href="">首页</a><a href="">产品列表</a><a href="">产品明细</a><a href="">关于我们</a><a href="">联系我们</a><a href="">客服</a></header><div class="container"><div class="left">左侧</div><div class="center">内容区</div><div class="right">右侧</div></div><footer><p>Copyright © 2020 All Rights Reserved 版权所有 网站</p></footer></body>

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