`toJSON()` 方法返回 `Date` 对象的字符串形式。

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## 语法

    dateObj.toJSON()

## 描述

`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。

## 样例

### `toJSON()` 样例

    var date = new Date();
    console.log(date); //Thu Nov 09 2017 18:54:04 GMT+0800 (中国标准时间)

    var jsonDate = (date).toJSON();
    console.log(jsonDate); //"2017-11-09T10:51:11.395Z"

    var backToDate = new Date(jsonDate);
    console.log(backToDate); //Thu Nov 09 2017 18:54:04 GMT+0800 (中国标准时间)

## 规范

规范 | 状态 | 说明
--- | --- | ---
ECMAScript 5.1 (ECMA-262) Date.prototype.toJSON | Standard | 首次定义，于 JavaScript 1.8.5 版本实现。
ECMAScript 2015 (6th Edition, ECMA-262) Date.prototype.toJSON | Standard |

## 浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

| Desktop | Mobile | Server
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet | Node.js
`toJSON` | Chrome Full support Yes | Edge Full support 12 | Firefox Full support 1 | IE Full support 8 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes

### Legend

Full support
  Full support

## 相关链接

- `Date.prototype.toLocaleDateString()`
- `Date.prototype.toTimeString()`
- `Date.prototype.toUTCString()`