JavaScript样式：可选回调 [英] JavaScript Style : optional callbacks

问题描述

我有一些函数，我想要偶尔运行回调但不总是，是检查回调是否定义/函数是一个好的风格还是有更好的方法？

I have some functions which I will want to ocasionally run a callback in but not always, is checking if the callback is defined/function a good style or is there a better way?

例如：

function save (callback){
.....do stuff......
   if(typeof callback !== 'undefined'){
     callback();
   };
};

推荐答案

我个人更喜欢

typeof回调==='function'&& callback（）;

typeof 命令很简单， undefined和function

typeof！== undefined 的问题是用户可能传入定义的值，而不是函数

The problems with the typeof !== undefined is that the user might pass in a value that is defined and not a function

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