Ajax请求全局设置，详细请$.ajax选项描述。

返回值：undefined

参数：

• settings (Map): 用于Ajax请求的键／值对。

示例：

$.ajaxSetup( {
 url: "/xmlhttp/",
 global: false,
 type:   "POST" 
} ); 
$.ajax({ data: myData }); 

Setup global settings for AJAX requests.

See $.ajax for a description of all available options.

Return value: undefined
Parameters:

• settings (Map): Key/value pairs to use for all AJAX requests

Example:

Sets the defaults for AJAX requests to the url "/xmlhttp/", disables global handlers and uses POST instead of GET. The following AJAX requests then sends some data without having to set anything else.

 $.ajaxSetup( { 
    url: "/xmlhttp/",
     global: false,
     type: "POST"   
} );   
$.ajax({ data: myData });