当调用特定的服务与Ajax调用IE9将返回未定义：

When calling specific service with ajax call IE9 returns "undefined":

$.ajax({
    url: URL_PATH,
    type: "get",
    success: function(data) {
        console.log(data);
    }
});

检查同一code在火狐，Chrome，IE10 +，它的工作原理。我甚至尝试添加：

Inspecting same code in Firefox, Chrome, IE10+, it works. I even tried adding:

contentType: "application/json; charset=utf-8",
datatype: "json",

要Ajax调用性能，但没有运气。

to ajax call properties, but no luck.

奇怪的是，当我叫本地JSON文件，一切都还好在IE9中，而是从本地服务器的URL（信息从数据库）返回时发生错误。纵观响应主体，我得到了良好的格式化JSON字符串。

Strange thing is that when I call a local JSON file, everything is okay in IE9, but when returning from local server url (information from database) that error occurs. Taking a look at response body, I got well formatted json string.

更新： 还增加了错误捕获块：

UPDATE: Also added the error catching block:

error: function(XMLHttpRequest)
    {
        console.log(XMLHttpRequest);
    },

但没有运气，它不走错误块中，它捕获成功

but no luck, it doesn't go inside the error block, it catches "success"

推荐答案

我发现了一个问题。我休息服务的响应头被设置为的charset = UTF8 和IE浏览器无法识别，而其他浏览器没有问题的工作，正确的拼写必须是 UTF-8 以短线:)一个新手的错误。谢谢大家的建议。现在关闭这个线程。

I found a problem. The response header of my rest service was set to charset=UTF8 and the IE couldn't recognize that while other browsers work with no problem, the correct spelling needs to be UTF-8 with a dash :) a rookie mistake. Thanks everyone for suggestions. Closing this thread now.