callbacks.has( callback )
描述: 确定列表中是否提供一个回调
添加的版本: 1.7callbacks.has( callback )
callback
类型: Function()
用来查找的回调函数。
例子:
使用 callbacks.has() 检查列表中是否提供一个回调:
// 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
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