可选回调的 JavaScript 样式 [英] JavaScript style for optional callbacks

问题描述

我有一些函数偶尔(并非总是)会收到回调并运行它.检查回调是否定义/函数是一种很好的风格还是有更好的方法?

I have some functions which occasionally (not always) will receive a callback and run it. Is checking if the callback is defined/function a good style or is there a better way?

示例:

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

推荐答案

我个人更喜欢

typeof callback === 'function' &&callback();

typeof 命令是狡猾的但是应该只用于 "undefined" 和 "function"

The typeof command is dodgy however and should only be used for "undefined" and "function"

typeof !== undefined 的问题在于，用户可能传入已定义的值，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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