选择篇(009)-下面代码的输出是什么？ 

[1, 2, 3, 4].reduce((x, y) => console.log(x, y))

A: 1 2 and 3 3 and 6 4 
B: 1 2 and 2 3 and 3 4
C: 1 undefined and 2 undefined and 3 undefined and 4 undefined
D: 1 2 and undefined 3 and undefined 4

参考答案:

posted @ 2021-12-13 14:20  手掌日月摘星辰  阅读(54)  评论(0)  编辑  收藏  举报