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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
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<title>无标题文档</title>
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<script language=javascript>
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function btnTest_onclick()
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{
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var testOptions=test.options;
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var i=0;
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for (i=0;i<testOptions.length;i++)
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{
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if(2==test.options[i].value)
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{
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test.selectedIndex=i
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}
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}
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}
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</script>
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</head>
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<body>
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<select name=test size=1>
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<option value="1">a</option>
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<option value="2">b</option>
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</select>
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<input type=button name=btnTest onclick="btnTest_onclick()" value="测 试">
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</body>
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</html>

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也是朋友问的(只要有人问也许别人还会问,以后就只发链接就OK了)