react-native javascript 中的 () => {} 和 function() {} 有什么区别？
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What is the difference between () => {} and function() {} in react-native javascript?
提问by Parth Tiwari
I have seen some functions defined as function(){}and some functions defined as () => {}.
我见过一些定义为的function(){}函数和一些定义为() => {}.
Is this related to Javascript version ES6?
这与 Javascript 版本 ES6 相关吗？
Also, how does use of thiskeyword change from one function definition to another?
此外，this关键字的使用如何从一个函数定义更改为另一个函数定义？
回答by cyberbit
The () => {}is called an arrow function. They are, as you said, part of ES6. From the linked page:
在() => {}被称为箭头功能。正如你所说，它们是 ES6 的一部分。从链接页面：
An arrow function expression has a shorter syntax compared to function expressions and lexically binds the
thisvalue (does not bind its ownthis,arguments,super, ornew.target). Arrow functions are always anonymous.
相比函数表达式的箭头函数表达式具有较短的语法和词汇结合
this值（不结合其自身的this，arguments，super，或new.target）。箭头函数总是匿名的。
