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function GetUrlParms(){
var args=new Object();
var query=location.search.substring(1);//»ñÈ¡²éѯ´®
var pairs=query.split("&");//ÔÚ¶ººÅ´¦¶Ï¿ª
for(var i=0;i<pairs.length;i++){
var pos=pairs[i].indexOf('=');//²éÕÒname=value
if(pos==-1) continue;//Èç¹ûûÓÐÕÒµ½¾ÍÌø¹ý
var argname=pairs[i].substring(0,pos);//ÌáÈ¡name
var value=pairs[i].substring(pos+1);//ÌáÈ¡value
args[argname]=unescape(value);//´æÎªÊôÐÔ
}
return args;
}
var args = new Object();
args = GetUrlParms();
//Èç¹ûÒª²éÕÒ²ÎÊýkey:
if(args["id"]!=undefined){
var value1 = args["id"] ;
alert(value1);
}


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var l = s.options.length;
for(var i=0;i<l;i++){
    s.options.remove(0);  
}
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<html>
<head>
<title>This is a test</title>
</head>
<script type="text/javascript">
var count;
</script>
<body>
<iframe id="child" src="childPage.html" src="childPage"></iframe>
</body>
</html> ......
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