锁定在其当前状态的回调列表。
用 callbacks.lock()锁定一个回调列表，以避免进一步的修改列表状态 :
// 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备案信息： 粤ICP备15087711号-2
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