Javascript - 使用 forEach 向后循环遍历数组
问题描述：
有没有一种方法可以使用 forEach(不是任何其他类型的循环，我知道如何使用 for/标准方法)在数组中向后循环而不实际反转数组本身?
Is there a way to loop backwards through an array using forEach (not any other kind of loop, I know how to do with with a for / standard ways) and without actually reversing the array itself?
答
let arr = [1, 2, 3];
arr.slice().reverse().forEach(x => console.log(x))将打印:
3
2
1
arr 仍然是 [1, 2, 3]，.slice() 创建一个浅拷贝.
arr will still be [1, 2, 3], the .slice() creates a shallow copy.