Question

考虑以下json模型：

{ 
   "idNumber": "8908904",
   "firstname": "John",
   "lastname": "Doe",
   "address": "12 Kent, Pluto, CBD, 67435"
}

有没有一种方法可以仅读取此json模型中的属性？

预期输出：

[ "idNumber", "firstname", "lastname", "address" ]

Answer 1

使用以下代码-

let keyArray = Object.keys({ 
                 "idNumber": "8908904",
                 "firstname": "John",
                 "lastname": "Doe",
                 "address": "12 Kent, Pluto, CBD, 67435"
               });
let requiredResponse = {keyArray};
console.log(requiredResponse.keyArray)  //[ "idNumber", "firstname", "lastname", "address" ]

Answer 2

const json = { 
   "idNumber": "8908904",
   "firstname": "John",
   "lastname": "Doe",
   "address": "12 Kent, Pluto, CBD, 67435"
};

json.entries = Object.keys(json);

正是您所需要的，它将返回与您期望的数组完全相同的

更新： 您不能在没有键的情况下将数组存储在Object中，因此您可能需要像上面一样在此将数组分配给新键，并且输出将如下所示：

{ 
   "idNumber": "8908904",
   "firstname": "John",
   "lastname": "Doe",
   "address": "12 Kent, Pluto, CBD, 67435",
   "entries": ["idNumber", "firstname", "lastname", "address"]
};

Angular 2及更高版本|从json提取属性

2 个答案: