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var i=0;
//对select进行监听,当i是偶数时,发生变化,i=i+1;
//当i是奇数时,不发生变化,i=i+1
<select class="Enable">
<option value="0">否</option>
<option value="1">是</option>
</select>
var i=0;
//对select进行监听,当i是偶数时,下拉菜单发生变化,i=i+1;
//当i是奇数时,下拉菜单不发生变化,即依然是改变之前的值,i=i+1
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<select class="Enable" id='test'>
<option value="0">否</option>
<option value="1">是</option>
</select>
<script type="text/javascript">
var i=0,k=0;
var d=document.getElementById('test');
d.onchange=function(){
i&1&&(this.selectedIndex=k);
k=this.selectedIndex;
i++;
}
</script>
</body>
</html>
??不明白你的意思