jquery 手册
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回调对象(Callbacks ..
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Returns: undefinedundefined .callbacks.add( Function callbacks )

描述:添加一个或一组回调函数到回调列表中。
  • version added: 1.7
  • .callbacks.add( Function callbacks )
  • callbacks 一个函数或函数数组

Example

callbacks.add()方法添加新的回调到回调列表中:

// a sample logging function to be added to a callbacks list
var foo = function( value ){
    console.log( 'foo:' + value );
}

// another function to also be added to the list
var bar = function( value ){
    console.log( 'bar:' + 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'

// add the function 'bar' to the list
callbacks.add( bar );

// fire the items on the list again
callbacks.fire( 'world' );  

// outputs:
// 'foo: world'
// 'bar: world'

Examples: