JavaScript函数是“函数"吗?或“对象"或两者? [英] Is JavaScript function a "function" or an "object" or both?

问题描述

我正在设法弄清Javascript函数的行为方式.它是功能还是对象，或者两者兼而有之?

I am trying to get my head around how Javascript function behaves. Is it a function or an object or both?

推荐答案

javascript中的函数是一类对象.因此，它们既是函数又是对象.

Functions in javascript are first-class objects. So they're both functions and objects.

由于它们是第一类对象，因此您可以将变量分配给函数并为其提供属性，例如:

Because they are first class objects, you can assign a variable to a function and give it properties, eg:

var addName=function(){}; 
addName.blah = 1;

如果它们不是一流的对象，那么您将只能使用这种语法，但是可以同时使用两种方法:

If they weren't first-class objects you'd be limited to this syntax but you can do it both ways:

function addName(){}

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