js获取get值

    //获取get值

    function getPar(par) {

        //获取当前URL

        var local_url = document.location.href;

        //获取要取得的get参数位置

        var get = local_url.indexOf(par + "=");

        if (get == -1) {

            return false;

        }

        //截取字符串

        var get_par = local_url.slice(par.length + get + 1);

        //判断截取后的字符串是否还有其他get参数

        var nextPar = get_par.indexOf("&");

        if (nextPar != -1) {

            get_par = get_par.slice(0, nextPar);

        }

        return get_par;

    }

    window.onload = function () {

       alert(getPar("XL"));

   }