callbacks函數方法：
callbacks.add() 将回調或回調的集合添加到回調清單。
callbacks.disable() 禁用回調清單做任何事情。
callbacks.disabled() 确定回調清單是否已禁用。
callbacks.empty() 從清單中删除所有回調。
callbacks.fire() 使用給定的參數調用所有回調。
callbacks.fired() 确定回調是否已經被調用至少一次。
callbacks.fireWith() 使用給定的上下文和參數調用清單中的所有回調。
callbacks.has() 确定清單是否附加了任何回調。 如果回調作為參數提供，則确定它是否在清單中。
callbacks.lock() 将回調清單鎖定在目前狀态。
callbacks.locked() 确定回調清單是否已被鎖定。
callbacks.remove() 從回調清單中删除回調或回調的集合。
callbacks.lock()示例：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>callbacks.lock demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<div id="log"></div>
<script>
// Simple function for logging results
var log = function( value ) {
$( "#log" ).append( "<p>" + value + "</p>" );
};
// Two sample functions to be added to a callbacks list
var foo = function( value ) {
log( "foo: " + value );
};
var bar = function( value ) {
log( "bar: " + value );
};
// Create the callbacks object with the "memory" flag
var callbacks = $.Callbacks( "memory" );
// Add the foo 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 "foo: world" isn't logged
// Add the foo function to the callback list again
callbacks.add( foo );
// Try firing the items again
callbacks.fire( "silentArgument" );
// Outputs "foo: hello" because the argument value was stored in memory
// Add the bar function to the callback list
callbacks.add( bar );
callbacks.fire( "youHadMeAtHello" );
// Outputs "bar: hello" because the list is still locked,
// and the argument value is still stored in memory
</script>
</body>
</html>
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