检索数组的 id

Question

当我做一个：

console.log(this.productService.getSortedProduct(graphicData)['finalProductList'])

我明白了：

0: []
1: []
2: []
3: []
4: []
5: []
6: []
7: Array(2)
   0: {products_id: 1039992, date: "2020-08-20"}
   1: {products_id: 1039997, date: "2020-08-20"}
8: []
9: []
10: []
11: []
12: Array(2)
   0: {products_id: 1039995, date: "2020-08-20"}
   1: {products_id: 1039996, date: "2020-08-20"}

如何从表中检索 products_Id 的所有值？

我在 google 上看到，我需要成为一个方法吗？

谢谢

Answer 1

您可以通过遍历数组来找到它。如果元素有值，则检索其元素，否则跳过它的迭代。

请使用简单的for 循环找到以下工作逻辑：

const arr = [
  [],
  [],
  [],
  [],
  [],
  [],
  [],
  [{
      products_id: 1039992,
      date: "2020-08-20"
    },
    {
      products_id: 1039997,
      date: "2020-08-20"
    },
  ],
  [],
  [],
  [],
  [],
  [{
      products_id: 1039995,
      date: "2020-08-20"
    },
    {
      products_id: 1039996,
      date: "2020-08-20"
    }
  ]
];

let result = [];

for (const item of arr) {
  if (item.length) {
    result = [...result, ...item.map(value => value.products_id)];
  }
}
console.log(result);