js获取地址栏参数（限于？后面的）

function getRequest() {
    var url = window.location.search; //获取url中"?"符后的字串
    var theRequest = new Object();
    if (url.indexOf("?") != -1) {
        var str = url.substr(1);
        strs = str.split("&");
        for(var i = 0; i < strs.length; i ++) {
            //就是这句的问题
            theRequest[strs[i].split("=")[0]]=decodeURI(strs[i].split("=")[1]);
            //之前用了unescape()
            //才会出现乱码
        }
    }
    return theRequest;
}