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说说箭头函数？ #28

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habc0807 opened this issue Aug 15, 2020 · 2 comments

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habc0807 commented Aug 15, 2020 •

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可以从箭头函数的定义、参数、函数体、以及跟普通函数的使用上区别聊聊。

habc0807 added ESNext es6 labels

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habc0807 commented Aug 15, 2020 •

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箭头函数没有 prototype，所以箭头函数不能当构造函数使用；
箭头函数不会创建自己的 this，它的this指向外层离它最近的 this，及时通过call、apply、bind也不能改变this的指向；
箭头函数不绑定 arguments，可以使用 rest 来访问箭头函数的参数列表

以上箭头函数跟普通函数的不同，根源是箭头函数没有的this和原型属性。

Jack-rainbow commented Sep 22, 2020

1.箭头函数的this指向外边一层函数的this，且不可以通过 call, bind,apply改变this指向
2.箭头函数没有arguments
3.箭头函数不可以new，因为不可以改变this指向和没有prototype

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