SOURCE

function getSum(a, b) {
    return a + b;
}
console.log('getSum(2,3)='+getSum(2,3));//5

const getSum1 = (a, b) => {
    return a + b;
};
console.log('getSum1(2,4)='+getSum1(2,4));//6

//省略大括号和return
const getSum2 = (a, b) => a + b;
console.log('getSum2(3,5)='+getSum2(3,5));//8

//若定义的箭头函数，参数只有一个，则可以省略小括号。
const func = (a) => {
    return a + 2;
};
console.log('func(1)='+func(1));//3

const func1 = a => a + 2;
console.log('func1(1)='+func1(3));//5

//指数运算符** 2的10次方
console.log(2**10);// 输出1024