从字符串标识符获取json字段

Question

假设我有一个看起来像这样的json：

let jsonExample = {
    "name": "foo",
    "age": 43,
    "number" : 13,
    "id": "osaid9r"
}

我的目标是创建一个JavaScript函数getField(json, fieldName)，该函数将接收json和代表字段名称的字符串，并返回由fieldName表示的值。

getField(jsonExample, "name") = "foo"
getField(jsonExample, "number") = 13

如何编写这样的功能？

Answer 1

您可以这样写：

let jsonExample = {
    "name": "foo",
    "age": 43,
    "number" : 13,
    "id": "osaid9r"
}
function getField(obj, field){ return obj[field];}
console.log(getField(jsonExample,"name"));
console.log(getField(jsonExample,"number"));

Answer 2

let jsonExample = {"name": "foo","age": 43,"number" : 13,"id": "osaid9r"}

function getField(json, key)
{ 
    return json[key];
}


console.log(getField(jsonExample,"number"));