javascript - 如何将指定值放入相应位置

Question

例如我有一串文字

"{"Date": 01/01/2019, "0": "John", "1": "Jack", "3": "Tom", "4": "Will", "5": "Joe"}"

还有，我有一个实体

function demo(first, second) {
    this.first = first,
    this.second = second
}

是否可以将文本字符串转换为实体？例如，

"Date" 转到 first

01/01/2019 转到 second

---

"0" 转到第一个

“John” 获得第二名

Answer 1

您可以创建自己的类，然后在您的json 对象上迭代创建对象

class CustomObject {
   constructor(x, y) {
     this.first = x;
     
     this.second = y;
   }
}

// your initial data as a json into a string
const str = '{"Date": "01/01/2019", "0": "John", "1": "Jack", "3": "Tom", "4": "Will", "5": "Joe"}';

// transform your string into a json object
const json = JSON.parse(str);

// Build the custom objects, using the data inside of the json object
// The notation [x, y] is called -> destructuring
const objs = Object.entries(json).map(([x, y]) => new CustomObject(x, y));

// Now that we have the objects, display the values stored inside
// each one of them, to show they are correctly settled
objs.forEach(x => console.log(x.first, x.second));