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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Date/toJSON below:

Date.prototype.toJSON() - JavaScript | MDN

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toJSON() 方法返回 Date 对象的字符串形式。

const event = new Date("August 19, 1975 23:15:30 UTC");

const jsonDate = event.toJSON();

console.log(jsonDate);
// Expected output: "1975-08-19T23:15:30.000Z"

console.log(new Date(jsonDate).toUTCString());
// Expected output: "Tue, 19 Aug 1975 23:15:30 GMT"

Date 实例引用一个具体的时间点。调用 toJSON() 返回一个 JSON 格式字符串（使用 toISOString()），表示该日期对象的值。默认情况下，这个方法常用于 JSON 序列化 Date 对象。

const jsonDate = new Date(0).toJSON(); // '1970-01-01T00:00:00.000Z'
const backToDate = new Date(jsonDate);

console.log(jsonDate); // 1970-01-01T00:00:00.000Z

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