javascript 为什么 JSON.stringify 搞砸了我的 datetime 对象？
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Why does JSON.stringify screw up my datetime object?
提问by TIMEX
{ id: 1533,
story_type_id: 1,
content_id: 470,
created_at: Sun, 05 Feb 2012 07:02:43 GMT,
updated_at: Sun, 05 Feb 2012 07:02:43 GMT,
type_name: 'post' }
I have a JSON object with the "datetime" field like above. It's perfect. But when I stringify it (I want to store it in cache), I get this format:
我有一个带有“日期时间”字段的 JSON 对象，如上所示。这是完美的。但是当我对它进行字符串化（我想将它存储在缓存中）时，我得到了这种格式：
"created_at":"2012-02-05T07:02:43.000Z"
This causes problems, because when I want to JSON.parse this, suddenly it's no longer datetime format and it's incompatible with my other format.
这会导致问题，因为当我想要 JSON.parse 这个时，突然它不再是日期时间格式并且它与我的其他格式不兼容。
What can I do to solve this problem? I have 'created_at' littered everywhere throughout my application. I don't want to manually change each one.
我能做些什么来解决这个问题？我在整个应用程序中到处都是“created_at”。我不想手动更改每一个。
回答by J. K.
There is not special way to serialize Dateobjects in JSON. That's why you get the standardized string representation. You need to convert them back to Dateobjects by passing them to the Dateconstructor.
没有特殊的方法来序列化DateJSON 中的对象。这就是您获得标准化字符串表示的原因。您需要通过将它们Date传递给Date构造函数来将它们转换回对象。
item['created_at'] = new Date(item['created_at']);
Update: With the reviverfunction (see comments), you can get the Dateobjects back.
更新：使用该reviver功能（请参阅评论），您可以取回Date对象。
var item = JSON.parse(row, function (key, value) {
if (key === 'created_at') {
return new Date(value);
} else {
return value;
}
});
回答by Juliane Holzt
It is actually possible to modify how a Date object will be serialized into JSON. Combined with the reviver function, a bi-directional solution can be created which will automatically work on serialization and can easily be used on deserialization.
实际上可以修改 Date 对象序列化为 JSON 的方式。结合reviver功能，可以创建双向解决方案，该解决方案将自动进行序列化，并且可以轻松用于反序列化。
First modify the serialization like this:
首先像这样修改序列化：
Date.prototype.toJSON = function() { return "{timestamp}+" . this.getTime() }
This will change the representation of a Date object into a UNIX timestamp with a prefix as a marker:
这会将 Date 对象的表示更改为带有前缀作为标记的 UNIX 时间戳：
> json = JSON.stringify({test:new Date()});
"{"test":"{timestamp}1380164268633"}"
Then you can create a reviver function which will automatically filter out these values:
然后你可以创建一个 reviver 函数，它会自动过滤掉这些值：
function json_deserialize_helper(key,value) {
if ( typeof value === 'string' ) {
var regexp;
regexp = /^{timestamp}(\d*)$/.exec(value);
if ( regexp ) {
return new Date(+regexp[1]);
}
}
return value;
}
(Credit: This code was basically copied from this answer in a related question: https://stackoverflow.com/a/14509447/2572897)
（信用：此代码基本上是从相关问题中的此答案中复制的：https: //stackoverflow.com/a/14509447/2572897）
Now with this setup, deserialization of our result from before will result in a Date object again:
现在有了这个设置，反序列化我们之前的结果将再次产生一个 Date 对象：
> JSON.parse(json, json_deserialize_helper);
Object {test: Thu Sep 26 2013 04:57:48 GMT+0200 (CEST)}
Or you can choose not to modify the serialization but instead use the regexp to catch the standard serialization format:
或者您可以选择不修改序列化，而是使用正则表达式来捕获标准序列化格式：
function json_deserialize_helper(key,value) {
if ( typeof value === 'string' ) {
var regexp;
regexp = /^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d.\d\d\dZ$/.exec(value);
if ( regexp ) {
return new Date(value);
}
}
return value;
}
Example:
例子：
> json = JSON.stringify({test:new Date()})
"{"test":"2013-09-26T03:05:26.563Z"}"
> JSON.parse(json, json_deserialize_helper)
Object {test: Thu Sep 26 2013 05:05:26 GMT+0200 (CEST)}
回答by Navid Golforoushan
Date.prototype.toJSON = function() { return moment(this).format('L'); }
Date.prototype.toJSON = function() { return moment(this).format('L'); }
You can read more about moment documentation and tailor type of date you want to return.
您可以阅读有关时刻文档的更多信息并定制您想要返回的日期类型。
回答by Majid joghataey
var date = new Date();
console.log(date);//Mon Jun 11 2018 10:14:33 GMT+0430 (Iran Daylight Time)
var json = JSON.stringify(date);
console.log(json);//"2018-06-11T05:44:33.590Z"
var dateStr = JSON.parse(json);
console.log(dateStr);//2018-06-11T05:44:33.590Z
var date = new Date(dateStr);
console.log(date);//Mon Jun 11 2018 10:14:33 GMT+0430 (Iran Daylight Time)
https://weblog.west-wind.com/posts/2014/Jan/06/JavaScript-JSON-Date-Parsing-and-real-Dates
https://weblog.west-wind.com/posts/2014/Jan/06/JavaScript-JSON-Date-Parsing-and-real-Dates
