js解析URL为对象函数实现

写一个parseQueryString 函数，将类似url = http://witmax.cn/index.php?key0=0&key1=1&key2=2解析成对象，结果如{key0: "0", key1: "1", key2: "2"}

functionparseQueryString(url){
var str = url.split('?')[1],
items = str.split('&'),
result = {},
res = {};
for(var i = 0, len = items.length(); i <len; ++i){
res = items[i].split("=");
result[res[0]] = res[1];
}
return result;
}