JQ動態獲取URL參數

$(function() {
        //從ulr中拿數據
        function GetQueryString(name) {
            var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg);
            if (r != null) return unescape(r[2]);
            return null;
        } //從url里邊拿數據
        var n = GetQueryString("id");//拿出URL中id,當id等於多少的時候動態進行修改頁面圖片
        if (n == 0) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left.png");
        } else if (n == 1) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_2.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left2.png");
        } else if (n == 2) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_3.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left3.png");
        } else if (n == 3) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_4.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left4.png");
        } else if (n == 4) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_5.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left5.png");
        } else if (n == 5) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_6.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left6.png");
        } else if (n == 6) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_7.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left7.png");
        } else if (n == 7) {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2_8.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left8.png");
        } else {
            $(".menu .menu_nr img.mnImg2").attr("src", "images/qdImg2.png");
            $(".advantage .col-sm-5 img").attr("src", "images/s1_left.png");
        }
    })