文章地址：https://www.cnblogs.com/sandraryan/
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p{
margin: 0;
line-height: 26px;
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<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
<p>this is a sentence.</p>
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// p中的奇数行偶数行设置不同的颜色
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$("p:even").css("backgroundColor","lightblue");
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