Question

我有一个像这样的数组：

arr = ['AD','CI','AI']

我有一个像

的对象

{ 
  "AD": "Mailing Address",
  "CI": "Additional Interest",
  "HO": "Homeowners",
  "AI": "Additional Interest"
}

在此对象包含键值对并形成数组键，该数组键如何将键与对象进行比较并获取键的值。如何从对象获取数组键的值？

Answer 1

使用Array.forEach()遍历数组并从对象获取值：

var arr = ['AD','CI','AI'];
var obj = {"AD": "Mailing Address","CI": "Additional Interest","HO":"Homeowners","AI": "Additional Interest"};
arr.forEach(key => console.log(obj[key]));

如果您想在循环中进一步使用该值，则将其设置为多行，例如：

var arr = ['AD','CI','AI'];
var obj = {"AD": "Mailing Address","CI": "Additional Interest","HO":"Homeowners","AI": "Additional Interest"};
arr.forEach((key) => {
  //some processing here
  console.log(obj[key]);
});

使用map()获取这些值的数组：

var arr = ['AD','CI','AI'];
var obj = {"AD": "Mailing Address","CI": "Additional Interest","HO":"Homeowners","AI": "Additional Interest"};
var res = arr.map((key) => obj[key]);
console.log(res);

Answer 2

这种单行代码将为您提供包含对象值的数组result。

let result = arr.map(a=>obj[a]);

Answer 3

您的情况需要阵列吗？如果只需要对象的值，则可以执行以下操作：

const obj = { 
  "AD": "Mailing Address",
  "CI": "Additional Interest",
  "HO": "Homeowners",
  "AI": "Additional Interest"
};

Object.entries(obj).forEach(([key, value]) => console.log(`${key}: ${value}`));

或

const obj = { 
  "AD": "Mailing Address",
  "CI": "Additional Interest",
  "HO": "Homeowners",
  "AI": "Additional Interest"
};

Object.keys(obj).forEach((key) => console.log(`${obj[key]}`));

希望这会有所帮助！

Javascript Map和Filter在两个数组上

3 个答案: