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@@ -0,0 +1,63 @@
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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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+ /* 并且/并列 */
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+ .box.div1{
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+ color: red;
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+ }
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+
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+ /* + 选中紧跟在后边的兄弟元素 */
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+ /* .li1+li{
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+ color: red;
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+ } */
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+ /* ~ 选中后边所有的兄弟 */
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+ .li1~li{
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+ color: red;
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+ }
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+ .box2{
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+ width: 400px;
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+ height: 400px;
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+ border:1px solid black
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+ }
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+ .box3{
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+ width: 300px;
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+ height: 300px;
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+ border:1px solid red;
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+ }
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+ .box4{
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+ width: 200px;
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+ height: 200px;
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+ border:1px solid blue;
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+ }
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+
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+ /* > 子代选择器 */
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+ .box2 > div{
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+ border:1px solid green;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box div1"> hello world </div>
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+ <div class="box"> 你好世界</div>
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+ <div class="div1">爱扣钉</div>
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+
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+ <ul>
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+ <li>项目一</li>
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+ <li class="li1">项目二</li>
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+ <li>项目三</li>
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+ <li>项目四</li>
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+ <li>项目五</li>
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+ <li>项目六</li>
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+ </ul>
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+
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+ <div class="box2">
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+ <div class="box3">
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+ <div class="box4"></div>
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+ </div>
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+ </div>
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+</body>
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+</html>
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