怎么从url截取需要信息

javascript代码：
function getQueryString(name) {
var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
var reg_rewrite = new RegExp("(^|/)" + name + "/([^/]*)(/|$)", "i");
var r = window.location.search.substr(1).match(reg);
var q = window.location.pathname.substr(1).match(reg_rewrite);
if(r != null){
return unescape(r[2]);
}else if(q != null){
return unescape(q[2]);
}else{
return null;
}
}
var token=getQueryString("token");

var id=getQueryString("id");