$.request = (function () {

var apiMap = {};

function request(queryStr) {

var api = {};

if (apiMap[queryStr]) {

return apiMap[queryStr];

}

api.queryString = (function () {

var urlParams = {};

var e,

d = function (s) { return decodeURIComponent(s.replace(/\+/g, " ")); },

q = queryStr.substring(queryStr.indexOf('?') + 1),

r = /([^&=]+)=?([^&]*)/g;

while (e = r.exec(q))

urlParams[d(e[1])] = d(e[2]);

return urlParams;

})();

api.getUrl = function () {

var url = queryStr.substring(0, queryStr.indexOf('?') + 1);

for (var p in api.queryString) {

url += p + '=' + api.queryString[p] + "&";

}

if (url.lastIndexOf('&') == url.length - 1) {

return url.substring(0, url.lastIndexOf('&'));

}

return url;

}

apiMap[queryStr] = api;

return api;

}

$.extend(request, request(window.location.href));

return request;

})();

详细出处参考：