示例

描述:

使用callbacks.fired() 确定，如果列表中的回调至少有一次被呼叫

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 function 'foo' to the list
callbacks.add( foo );

// fire the items on the list
callbacks.fire( 'hello' ); // outputs: 'foo: hello'
callbacks.fire( 'world '); // outputs: 'foo: world'

// test to establish if the callbacks have been called
console.log( callbacks.fired() );