通过字符串截取的方式获取参数值

function GetRequest(urlStr) {
     if (typeof urlStr == "undefined") {
        var url = decodeURI(location.search); //获取url中"?"符后的字符串
    } else {
         var url = "?" + urlStr.split("?")[1];
    }
    var theRequest = new Object();
    if (url.indexOf("?") != -1) {
        var str = url.substr(1);//去掉问号，问号为第一个字符
        var strs = str.split("&");
         for (var i = 0; i < strs.length; i++) {
            theRequest[strs[i].split("=")[0]] = decodeURI(strs[i].split("=")[1]);
         }
     }
     return theRequest;
}