Question

我有一个查询，返回一个带有Object.key（数组）的数组。foreach我正在迭代，我想知道特定数组中属性的值。示例：

 Object.keys(arreglo).forEach(function(key) {
        console.log(arreglo[key]);
    });

输出为：名称：“ Pepito”，姓：“ Perez” 我想知道如何仅获取姓氏的值我知道这行不通，但是会像这样：

console.log(arreglo[key].surname);

Answer 1

这就是您要寻找的

const object1 = {
  a: {firstname:"sali",lastname:"mali"},
  b: {firstname:"sali",lastname:"mali"},
  c: {firstname:"sali",lastname:"mali"}
};

Object.keys(object1).forEach(function(key){console.log(object1[key].lastname)});

Answer 2

您可以在原始数组上使用Array.map，如下所示。您甚至可以使用// let's assume the arrary you got from your query is in this format const arreglo = [ { firstname: "fn1", surname: "ln1"}, { firstname: "fn2", surname: "ln2"}, { firstname: "fn3", surname: "ln3"} ]; // you can log `surname` for each entry in the array arreglo.forEach(v => console.log(v.surname)); // you can use map to transform the array to just have `surname` using array.map() const surnames = arreglo.map(v => v.surname); console.log(surnames);提取您感兴趣的字段。

list.slice(0, 5).map((i) => {
    return <div>{i}</div>
});

访问Object.keys adonis.js（Node.js）中的特定属性

2 个答案: