jq获取地址栏参数

            (function($){
			    $.getUrlParam = function(name) {
			        var age = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
			        var r = window.location.search.substr(1).match(age);
			       if(r != null) {
			           return unescape(r[2]);
			        }
			            return null;
			        }
			})(jQuery)
			$(function() {
				var a = $.getUrlParam('id')
				$.alert(a);
			})