Detailed explanation of usage examples of jQuery.ajaxSetup() function

jQuery.ajaxSetup()Function is used to set the global default settings of AJAX.

This function is used to change the default setting options for AJAX requests in jQuery. All AJAX requests executed thereafter will use the changed default settings if the corresponding option parameter is not set.

This function belongs to the global jQuery object.

Syntax

jQuery 1.1 adds this static function.

jQuery.ajaxSetup(settings)

Parameters

Parameter Description

settings Object classType an object, each of which The attribute represents the option whose default setting needs to be changed, and the attribute value represents the changed default value.

For the attributes that can be recognized by the settings parameter, please refer to the settings parameter description in jQuery.ajax(). All option parameters are optional.

Return value

The jQuery.ajaxSetup() function has no return value, or its return value is undefined.

Example & Description

The following is the jQuery sample code related to the jQuery.ajaxSetup() function to demonstrate the specific usage of the jQuery.ajaxSetup() function:

//设置AJAX的全局默认选项
$.ajaxSetup( {
    url: "/index.html" , // 默认URL
    aysnc: false , // 默认同步加载
    type: "POST" , // 默认使用POST方式
    headers: { // 默认添加请求头
        "Author": "CodePlayer" ,
        "Powered-By": "CodePlayer"
    } ,
    error: function(jqXHR, textStatus, errorMsg){ // 出错时默认的处理函数
        // jqXHR 是经过jQuery封装的XMLHttpRequest对象
        // textStatus 可能为： null、"timeout"、"error"、"abort"或"parsererror"
        // errorMsg 可能为： "Not Found"、"Internal Server Error"等
        // 提示形如：发送AJAX请求到"/index.html"时出错[404]：Not Found
        alert( '发送AJAX请求到"' + this.url + '"时出错[' + jqXHR.status + ']：' + errorMsg );        
    }
} );
// 未设置任何参数，但url、async、type、headers、error等参数的默认值均已被$.ajaxSetup()更改(如上)
$.ajax( );
// 设置了url、type、success、error，就使用自己设置的参数值
// 但async、headers等参数的默认值已被$.ajaxSetup()更改
$.ajax( {
    url: "myurl.php?action=list" ,
    type: "GET" ,
    success: function( data, textStatus, jqXHR ){
        alert("返回数据：" + data);
    } ,
    error: function(jqXHR, textStatus, errorMsg){
        alert("自己的error!");        
    }
});
// 上述$.ajaxSetup()的默认设置对$.get()、$.post()、load()、$.getJSON()、$.getScript()等AJAX函数也生效
// 因为这些函数也是在内部调用$.ajax()函数来实现的，只不过它们在内部都设置了一些参数
// $.get()在内部调用$.ajax()时已设置type为"GET"，因此仍然使用GET方式。
// 但url、async、headers、error等参数的默认值已被$.ajaxSetup()更改
$.get( );
// $.post()在内部调用$.ajax()时已设置type为"POST"，因此仍然使用POST方式。
// url也被设置为"user/action.php?method=addUser"
// 但async、headers、error等参数的默认值已被$.ajaxSetup()更改
$.post( "user/action.php?method=addUser" );

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