JS获取URL中的参数

function getarg()
{
var url = unescape(window.location.href);
var allargs = url.split("?")[1];
var args = allargs.split("&");
for(var i=0; i<args.length; i++)
{
var arg = args[i] .split("=");
eval('this.'+arg[0]+'="'+arg[1]+'";');
}
}
var urlarg=new getarg();
if(urlarg.clid=="1")
{
sub_nav_6.style.display = "block";
li6.style.background = "#a1ca00";
}