javascript - 为什么JS中的bind方法返回的函数没有prototype值？

问题描述

问 题

如题

function func () {}
console.log(func.prototype) // Object {}

var fn = func.bind(this)
console.log(fn.prototype)  // undefined ?

解决方案

emca-262里面这么说

https://www.ecma-internationa...

19.2.3.2
NOTE 1
Function objects created using Function.prototype.bind are exotic objects. They also do not have a prototype property.

exotic ：奇异的特别的

19.2.4.3
Function objects created using Function.prototype.bind, or by evaluating a MethodDefinition (that are not a GeneratorMethod) or an ArrowFunction grammar production do not have a prototype property.

箭头函数也没有

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