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;}