## 返回值:undefinedcallbacks.lock()

### V1.7概述

锁定在其当前状态的回调列表。

### 示例

#### 描述:

用 callbacks.lock()锁定一个回调列表，以避免进一步的修改列表状态 :

##### 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();

    // try firing the items again
    callbacks.fire( 'world' );

    // as the list was locked, no items
    // were called so 'world' isn't logged