$.ajax({
type: "POST",
url: urlString,
data: { formaaqq: 'tt' },
dataType: "json",
success: function(data) {
alert("dd");
},
error: function(){
}

});

参数参考地址：

http://www.runoob.com/jquery/ajax-ajax.html

http://blog.sina.com.cn/s/blog_4f925fc30100la36.html