JAVASCRIPT PARAM 값 가져오기

//선언
var Request = function(){
	this.getParameter = function(name){
		var rtnval='';
		var nowAddress = unescape(location.href);
		var parameters = (nowAddress.slice(nowAddress.indexOf('?')+1,nowAddress.length)).split('&');
		for(var i = 0 ; i< parameters.length ; i++){
			var varName = parameters[i].split('=')[0];
			if(varName.toUpperCase() == name.toUpperCase()){
				rtnval = parameters[i].split('=')[1];
				break;
			}
		}
		return rtnval;
	}
}

 
//사용법
var request = new Request();
request.getParameter('key 값')