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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ /* 通配符选择器 * 对全局做匹配 */
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+ * {
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+ list-style: none;
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+ /* font-size:30px; */
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+ }
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+ /* 标签选择器 */
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+ div {
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+ width: 200px;
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+ height: 200px;
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+ background: #f00;
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+ }
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+ /* id选择器 */
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+ #word {
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+ color: #00f;
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+ }
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+ /* 类选择器 */
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+ .name {
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+ color: #0f0;
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+ }
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+ /* 包含选择器 后代选择器 */
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+ .name span {
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+ color: #f00;
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+ }
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+ /* 伪类选择器 */
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+ .list1 li:nth-child(2){
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+ color: #f00;
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+ }
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+ .list1 li:first-child{
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+ color: #00f;
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+ }
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+ .list1 li:last-child {
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+ color:#0f0;
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+ }
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+ .list1 li:nth-child(odd) {
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+ color: #ff0;
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+ }
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+ ul li:hover {
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+ color: orange;
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+ }
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+ /* 子类选择器 用>连接 */
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+ .name>span {
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+ color: #00f;
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+ }
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+ /* 群组选择器 用,连接 */
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+ #word,.name {
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+ color:red;
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+ }
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+ /* .name {
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+ color: red;
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+ } */
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+ /* 属性选择器
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+ 写法：
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+ 在body标签中：当前标签的属性里添加xxx(内容)
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+ 在style中：
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+ 标签名[属性="xxx"]{样式...}
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+ */
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+ img[alt="www"] {
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+ width: 200px;
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+ height: 200px;
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+ }
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+ /*
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+ 伪元素选择器
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+ :before :after
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+ 一定要伴随这 content:"要添加的内容"
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+ ::before ::after
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+ :与::的区别
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+ ::使用在css2语法中
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+ :使用在css3语法中
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+
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+ */
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+ .one {
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+ width: 400px;
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+ height: 200px;
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+ background: #ff0;
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+ }
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+ .one:after {
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+ content:"今天下雪了";
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+ color: #f00;
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+ background-color: #0f0;
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+ }
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+ .one:before {
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+ content:"明天周五了";
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+ color: #00f;
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+ }
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+ /* !important */
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+ .list2 li:nth-child(2) {
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+ color: #f00 !important;
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+ }
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+ .list2 li:nth-child(2) {
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+ color: #00f;
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+ }
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+ /* 相邻选择器 用+连接 */
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+ h1+h2 {
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+ color: red;
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+ }
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+ h2+h3 {
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+ color: #00f;
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+ }
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+ /* 兄弟选择器 用~连接 */
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+ h1~h3 {
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+ color: #0f0;
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+ }
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+ h2~h5 {
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+ color: purple;
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+ }
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+ #word~.name{
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+ color: purple;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <!--
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+ 标签选择器:
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+ 写法：标签名 {样式}
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+ -->
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+ <div></div>
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+ <p id="word">这是一段文字</p>
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|
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+ <p class="name">我的<span>名字</span></p>
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+ <ul class="list1">
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+ <li>内容1</li>
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+ <li>内容2</li>
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+ <li>内容3</li>
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+ <li>内容4</li>
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+ </ul>
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+ <img src="../day3/images/1.jpg" alt="www">
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+ <div class="one">这是内容一</div>
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+ <ul class="list2">
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+ <li>内容11</li>
|
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|
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+ <li>内容22</li>
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+ <li>内容33</li>
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+ <li>内容44</li>
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+ </ul>
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+ <h1>标签</h1>
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+ <h2>标签</h2>
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+ <h3>标签</h3>
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+ <h4>标签</h4>
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+ <h5>标签</h5>
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+</body>
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+</html>
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e