解决JS传参中文乱码

function PopupFK(cNum,type){
var url = "contract!Paying.action";
url = url + "?contract.contractNum="+cNum+"&payingType="+type;
// if(isEmpty($(_this).attr("payId"))){
// url = url + "&s_paymentId="+paymentId;
// url = url + "&s_paymentDtlId="+paymentDtlId;
// }else{
// url = url + "&s_payId="+$(_this).attr("payId");
// }
url = url+"&random="+Math.random();
　　　　 //在这里。用encodeURI进行两次转码。后台Action接收的时候。在进行一次。就不会出现乱码问题
url = encodeURI(url);
url = encodeURI(url);
　　var ret = window.showModalDialog(
url,
"",
"dialogWidth=950px;dialogHeight=600px;center=yes;border=thick;status=no;help=no;scrollbars=no"
);

}
下面是Action代码片段

String cNum = contract.getContractNum();
String Num;
try {
Num = URLDecoder.decode(cNum,"utf8");
System.out.println(Num);
c = csl.queryOneByNum(Num);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("合同数据错误，请联系管理员");

}