js 解析URL 的参数

var url = “http://www.taobao.com/index.php?key0=0&key1=1&key2=2.....”
var obj = parseQueryString(url);
alert(obj.key0)  // 输出0

function parseQueryString(url){
var obj = {};
var start = url.indexOf("?")+1;
var str = url.substr(start);
var arr = str.split("&");
for(var i = 0 ;i < arr.length;i++){
var arr2 = arr[i].split("=");
obj[arr2[0]] = arr2[1];
}
return obj;
}
var obj = parseQueryString("http://www.taobao.com/index.php?key0=0&key1=1&key2=2");
alert(obj.key0);