Turn URL to Object

Implement a method that is to turn the URL into an object (requires that the parameter is a URL, the return value is an object)
function Formstr (URL) {
var obj={};
if (URL) {
Intercept string
var str=url.substring (Url.indexof ('? ') +1);
var arr=str.split ("&");//Transfer to Group
for (Var i=0;i<arr.length;i++) {
var kv=arr[i].split ("=");
OBJ[KV[0]]=KV[1];
}

}
return obj;
};
var url= ' www.baidu.com/a/b?flag=123&abc=eee&qwe=890980 ';
Console.log (formstr (URL));

Turn URL to Object