核心是：找到并且匹配然后显示效果
怎么找？
通过id
这样说好像太裸铜了把。
<li><a href="#p1">李文1</a></li>
记住：#代表要找的为id，p1代表要找到是什么，知道把，记住。是往下找的哈，记住#代表id哈
找到了之后怎么匹配？
找到了id为p1的之后，就要看看有没有.chapter的了，有就能显现效果了
为什么就能直接显现效果了呢？
因为:target代表动的时候就触发了哈
.chapter:target
怎么显示效果？
border: 1px solid red;color: blue;
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Document</title><style type="text/css">.chapter:target/*意思是可用于点击的当前的目标元素*/{/*再有所有.chapter的class中找出点击的目标元素*/border: 1px solid red;color: blue;}</style>
</head>
<body>核心根据#代表找id为什么<h3>陈业贵</h3><h2>陈业贵</h2><ul class="chapterList"><li><a href="#p1">李文1</a></li><li><a href="#p2">李文2</a></li><li><a href="#p3">李文3</a></li><li><a href="#p4">李文4</a></li><li><a href="#p5">李文5</a></li></ul>
<h3 id="p1" class="chapter">李文1</h3>
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<h3 id="p2" class="chapter">李文2</h3>
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<h3 id="p3" class="chapter">李文3</h3>
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<h3 id="p4" class="chapter">李文4</h3>
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<h3 id="p5" class="chapter">李文5</h3>
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