Js 實現隔行換色及其滑鼠划過變色

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
<style>
body{ font-size:12px; line-height:21px; color:#3E352F;}
ul{ width:200px; list-style:none;}
.one{ background:#f00;}
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.one.three{ background:#fff}
.two.three{ background:#000}
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<script>
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 function set(){
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    this.className="one";
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   obj[i].className="two";
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onload=set
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</head>
<body>
 <ul>
  <li>1.假字以數十字為基礎假字數…</li>
  <li>2.假字以數十字為基礎假字數…</li>
  <li>3.假字以數十字為基礎假字數…</li>
  <li>4.假字以數十字為基礎假字數…</li>
  <li>5.假字以數十字為基礎假字數…</li>
 </ul>
</body>
</html> 
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