自动选中下拉菜单项的javascript代码

in 网络编程
<form name=a>
<select name="zone">
<option value="第1项">第一项</option>
<option value="第2项">第二项</option>
<option value="第3项">第三项</option>
<option value="第4项">第四项</option>
</select>
</form>
<script language=javascript>
var myvalue="第4项"
document.a.zone.value=myvalue;
</script>
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