## 返回值:Booleancallbacks.locked()

### V1.7概述

确定是否已被锁定的回调列表。

### 示例

#### 描述:

用 callbacks.locked() 确定是否已被锁定的回调列表。:

##### 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 logging function to the callback list
    callbacks.add( foo );

    // fire the items on the list, passing an argument
    callbacks.fire( 'hello' );
    // outputs 'foo: hello'

    // lock the callbacks list
    callbacks.lock();

    // test the lock-state of the list
    console.log ( callbacks.locked() ); //true