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a.ex1:hover, a.ex1:active {color: red;}
a.ex2:hover, a.ex2:active {font-size: 150%;}
a.ex3:hover, a.ex3:active {background: red;}
a.ex4:hover, a.ex4:active {font-family: monospace;}
a.ex5:visited, a.ex5:link {text-decoration: none;}
a.ex5:hover, a.ex5:active {text-decoration: underline;}
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<p>将鼠标悬停在链接上可查看它们的变化。</p>
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<p><a class="ex1" href="default.asp">这个链接会改变颜色</a></p>
<p><a class="ex2" href="default.asp">这个链接会改变字体大小</a></p>
<p><a class="ex3" href="default.asp">这个链接会改变背景颜色</a></p>
<p><a class="ex4" href="default.asp">这个链接会改变字体</a></p>
<p><a class="ex5" href="default.asp">这个链接会改变文本装饰</a></p>
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</body>
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