js post请求外部获取响应数据

$.ajaxSettings.async = false;//异步请求不往下执行
        var  v = $.post("", {sbid:sbid},function(data2) {
               
                data2 = JSON.parse(data2);
                return data2;
                
            });
        $.ajaxSettings.async = true;//结束
    var vv = JSON.parse(v.responseText);//获取数据