jquery json jsp

function ajax_post(the_url,the_param,succ_callback){
if(typeof ajax_already_setup == 'undefined')ajax_setup();
$.ajax({
type : 'POST',
cache : false,
url : the_url,
data : the_param,
success
: succ_callback
});
}

function ajax_setup() {

ajax_already_setup = true;
var errorFields = [];
$.ajaxSetup({
error : function(xhr, ajaxOptions, thrownError) {
var jsonResult = null;
try {
jsonResult=jQuery.parseJSON(xhr.responseText);
            }
            catch (e) {}

switch (xhr.status){
case 400:
if(jsonResult == null || jsonResult == null){
return;
}
$('.control-group').removeClass('error');
$('.error-tip-temp').html('').removeClass('error-tip-temp');
$.each(jsonResult.errors,function(idx,data){
errorFields.push(data.field);
var p = $('input[name="'+data.field+'"]').parents('.control-group');
$('.help-inline',p).addClass('error-tip-temp').html(data.msg);
if(!p.hasClass('error'))
{
p.addClass('error');
}
});
break;
case 401:
alert("登入逾時,請重新登入 ");
location.href = "/";
break;
default:
if(xhr.status !=0)
alert("錯誤,代碼:" +xhr.status+ "，請稍候再試");
break;
}
},
complete:function(e, xhr, settings){
if(xhr != "error"){
errorFields = [];
$('.control-group').removeClass('error');
$('.error-tip-temp').html('').removeClass('error-tip-temp');
}
}
});
}