### 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 ~~~