这两种函数语法类型有什么区别 [英] What is the difference between these 2 function syntax types

问题描述

正如标题所说，

MyFunction = function() {

}

和

function MyFunction() {

}

什么都没有？

重复： var functionName = function（）{} vs function functionName（）{}

推荐答案

第一种形式实际上是一个赋值给它的匿名函数的变量，第二种形式是声明函数。

The first form is actually a variable with an anonymous function assigned to it, the second is a declared function.

他们几乎可以互换，但有一些不同之处：调试器使用anons会更难（因为他们没有名字）和JS引擎可以直接访问脚本中存在的声明函数，但是在分配之后才能访问它们。

They're almost interchangeable, but have some differences: debuggers have a harder time with anons (because they lack a name) and the JS engine can directly access declared functions wherever they exist in the script, but anons can't be accessed until they have been assigned.

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