jquery noop 函数的用法之一是什么

Question

扩展此链接What is the use of jQuery.noop() function?

You can use this empty function when you wish to pass 
around a function that will do nothing.

This is useful for plugin authors who offer optional callbacks; 
in the case that no callback is given, something like jQuery.noop could execute.

提供可选回调的插件作者是什么意思，一个例子就可以了。

Answer 1

例如，带有可选完成失败并且总是回调的插件：

options: {
    done: $.noop,
    fail: $.noop,
    always: $.noop
}

现在插件作者可以假设每个都定义了一个回调，即使使用插件的开发人员没有通过一个。

https://github.com/jquery/jquery/blob/1.9-stable/src/core.js#L577