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