Question

我有一个这样的荒谬对象。

{
order: ["a1","a2","a3","a4"],  
posts: {
a1: {id: "a1",message: "This is a1"},
a4: {id: "a4",message: "This is a4"},
a3: {id: "a3",message: "This is a3"},
a2: {id: "a2",message: "This is a2"},
}
}

我需要从“ posts”对象中获取“ message”值，并在“ order”数组中定义顺序。我可以foreach“顺序”数组，但是如何知道当我有“ a1”字符串时，我需要在“ posts”对象中使用“ a1”对象吗？

谢谢！

Answer 1

所有您需要做的就是在order数组上进行映射，并使用方括号表示法基于键返回对象，

const data = {
order: ["a1","a2","a3","a4"],  
posts: {
a1: {id: "a1",message: "This is a1"},
a4: {id: "a4",message: "This is a4"},
a3: {id: "a3",message: "This is a3"},
a2: {id: "a2",message: "This is a2"},
}
}

const res = data.order.map((id) => {
    return data.posts[id];
})

console.log(res);

Answer 2

希望以下代码会有所帮助。

const data = {
order: ["a1","a2","a3","a4"],  
posts: {
a1: {id: "a1",message: "This is a1"},
a4: {id: "a4",message: "This is a4"},
a3: {id: "a3",message: "This is a3"},
a2: {id: "a2",message: "This is a2"},
}
}

Object.entries(data.order).forEach(([key, val]) => {
    console.log(data.posts[val]);          
});

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2 个答案: