angular.js - ts forEach的使用

Question

是这样的，假如我有一个三级的数组datas，想通过ts把它简化，返回最里面那一层的数据，然后在模板上面直接使用。
不怎么了解forEach的使用，在实践中报错了。初学者，希望大神勿喷，百度了forEach，没有详细说明。

Answer 1

forEach It seems that it is not from TS, but from ES. Usage is very simple

var a = [1, 2, 3]
a.forEach(function (e) {
    console.log(e);
});

This way you will get 1, 2, 3

If it is a multi-level array,

var b = [[1, 2], [3, 4], [5, 6]];
b.forEach(function (elementOutside) {
    elementOutside.forEach(function (elementInside) {
        console.log(elementInside);
    })
})

This way you get 1, 2, 3, 4, 5, 6

I don’t know what your specific needs are. . It would be best to add some additional explanation. Maybe what you need is not forEach 而是 map but map

Reference:
ES: https://developer.mozilla.org...

TS: https://www.typescriptlang.or...