callbacks.fired()

类别：回调函数对象

callbacks.fired()返回类型：Boolean

描述：确定某个回调函数是否已经至少被调用过一次。

示例：

使用callbacks.fired()来确定列表中的回调函数是否已经被调用过至少一次了：

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// 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() );