js替换url里面的变量

	function replaceParamVal(paramName,replaceWith) {
		    var oUrl = this.location.href.toString();
		    var re=eval('/('+ paramName+'=)([^&]*)/gi');
		if (re.test(oUrl)){
		var nUrl = oUrl.replace(re,paramName+'='+replaceWith);
		}else{
		if(oUrl.indexOf('?')>0){
		var nUrl = oUrl+"&"+paramName+"="+replaceWith;
		}else{
		var nUrl = oUrl+"?"+paramName+"="+replaceWith;
		}
		}
		    this.location=nUrl;
		}

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