### 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 ~~~