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確定是否提供的回調(diào)列表
用來搜索的回調(diào)。
用 callbacks.has() 檢查是否回調(diào)列表中包含一個特定的回調(diào):
// a sample logging function to be added to a callbacks list var foo = function( value1, value2 ){ console.log( 'Received:' + value1 + ',' + value2 ); } // a second function which will not be added to the list var bar = function( value1, value2 ){ console.log( 'foobar'); } var callbacks = $.Callbacks(); // add the log method to the callbacks list callbacks.add( foo ); // determine which callbacks are in the list console.log( callbacks.has( foo ) ); // true console.log( callbacks.has( bar ) ); // false