## 返回值:Booleancallbacks.fired()

### V1.7概述

用给定的参数调用所有的回调。

### 示例

#### 描述:

使用callbacks.fired() 确定，如果列表中的回调至少有一次被呼叫

##### jQuery 代码:

    // a sample logging function to be added to a callbacks list
    var foo = function( value ){
        console.log( 'foo:' + value );
    }

    var callbacks = $.Callbacks();

    // add the function 'foo' to the list
    callbacks.add( foo );

    // fire the items on the list
    callbacks.fire( 'hello' ); // outputs: 'foo: hello'
    callbacks.fire( 'world '); // outputs: 'foo: world'

    // test to establish if the callbacks have been called
    console.log( callbacks.fired() );