1.只有一个入参时候可以省略括号
const greet = (who) => {
return `${who}, Welcome!`
};
const greet = who => {
return `${who}, Welcome!`
};
2.参数可以带默认值，但是需要带括号
const greet = (who) => {
return `${who}, Welcome!`
};
const greet = (who = 'green')=> {
return `${who}, Welcome!`
};
3.可以已解构的参数
const greetDestruct = ({ who }) => {
return `${who}, Welcome!`;
};
const race = {
planet: 'Jupiter',
who: 'Jupiterians'
};
greetDestruct(race);
4.当箭头函数主体内仅包含一个表达式时，可以去掉return 关键字
const greetConcise = who => `${who}, Welcome!`;
greetConcise('Friends');
5.简洁写法（阅读困难，并不推荐）
const multiplyFactory = m => {
return x => x * m;
};
const double = multiplyFactory(2);
double(5); // => 10
const multiplyFactory = m => x => x * m;
const double = multiplyFactory(2);
double(5); // => 10
