Javascript 代码使用箭头函数而不是普通函数

Question

我的 javascript 代码适用于箭头功能，但不适用于普通功能

//NORMAL FUNCTION (not working)
function multiplier(factor) {
    return function (number) {
        number * factor;
    }
}
const twice = multiplier(2);
console.log(twice(5));


//ARROW FUNCTION (working)
function multiplier(factor) {
    return number => number * factor;
}
const twice = multiplier(2);
console.log(twice(5));

谢谢

Answer 1

您在内部函数中缺少 return 语句

function multiplier(factor) {
    return function (number) {
        return number * factor;
    }
}