jQuery ajaxSetup（）メソッド
例
すべてのAJAXリクエストにデフォルトのURLと成功関数を設定します。
$("button").click(function(){
$.ajaxSetup({url: "demo_ajax_load.txt", success: function(result){
$("div").html(result);}});
$.ajax();
});
定義と使用法
ajaxSetup（）メソッドは、将来のAJAXリクエストのデフォルト値を設定します。
構文
$.ajaxSetup({name:value, name:value, ... })
パラメーターは、1つ以上の名前/値のペアを持つAJAXリクエストの設定を指定します。
以下の表で可能な名前/値：
| Name | Value/Description |
|---|---|
| async | A Boolean value indicating whether the request should be handled asynchronous or not. Default is true |
| beforeSend(xhr) | A function to run before the request is sent |
| cache | A Boolean value indicating whether the browser should cache the requested pages. Default is true |
| complete(xhr,status) | A function to run when the request is finished (after success and error functions) |
| contentType | The content type used when sending data to the server. Default is: "application/x-www-form-urlencoded" |
| context | Specifies the "this" value for all AJAX related callback functions |
| data | Specifies data to be sent to the server |
| dataFilter(data,type) | A function used to handle the raw response data of the XMLHttpRequest |
| dataType | The data type expected of the server response. |
| error(xhr,status,error) | A function to run if the request fails. |
| global | A Boolean value specifying whether or not to trigger global AJAX event handles for the request. Default is true |
| ifModified | A Boolean value specifying whether a request is only successful if the response has changed since the last request. Default is: false. |
| jsonp | A string overriding the callback function in a jsonp request |
| jsonpCallback | Specifies a name for the callback function in a jsonp request |
| password | Specifies a password to be used in an HTTP access authentication request. |
| processData | A Boolean value specifying whether or not data sent with the request should be transformed into a query string. Default is true |
| scriptCharset | Specifies the charset for the request |
| success(result,status,xhr) | A function to be run when the request succeeds |
| timeout | The local timeout (in milliseconds) for the request |
| traditional | A Boolean value specifying whether or not to use the traditional style of param serialization |
| type | Specifies the type of request. (GET or POST) |
| url | Specifies the URL to send the request to. Default is the current page |
| username | Specifies a username to be used in an HTTP access authentication request |
| xhr | A function used for creating the XMLHttpRequest object |
自分で試してみてください-例
AJAXリクエストのエラーハンドラを指定するエラー設定を使用して