Question

例如，我有一串文字

            var dateString = "2018/09/12";

            var regex = /^\d{4}\/((0\d)|(1[012]))\/(([012]\d)|3[01])$/;
            if (regex.test(dateString)) {
                return true;
            } else {
                return false;
            }

我还有一个实体

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

是否可以将文本字符串转换为实体？例如，

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

first转到01/01/2019

second转到"0"

first排名第二

Answer 1

您可以创建自己的class，然后创建在json对象上迭代的对象

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));

Answer 2

Object.keys(json)将与map函数结合使用：

const str = '{"Date": "01 / 01 / 2019", "0": "John", "1": "Jack", "3": "Tom", "4": "Will", "5": "Joe"}';
const json = JSON.parse(str);

function demo(first, second) {
    console.log(first, second);
    this.first = first,
    this.second = second
}

Object.keys(json).map(key => {
    demo(key, json[key]);
});

如何将指定的值放入各自的位置

2 个答案: