typescript 类型错误：formats.dateTimeString.toISOString 不是函数
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TypeError: formats.dateTimeString.toISOString is not a function
提问by JB123
I'm new to TypeScript and AngularJS, and I'm trying to convert a date from my API that is something like:
我是 TypeScript 和 AngularJS 的新手，我正在尝试从我的 API 中转换一个类似于以下内容的日期：
"8/22/2015"
...to an ISO Date. The date is properly deserialized into a TypeScript property of type Date. However, when I try the following command (in typescript, and this.dateDisplayis of type string)
...到 ISO 日期。日期被正确反序列化为 type 的 TypeScript 属性Date。但是，当我尝试以下命令时（在打字稿中，并且this.dateDisplay是字符串类型）
this.dateDisplay = formats.dateTimeValue.toISOString();
I get the error:
我收到错误：
TypeError: formats.dateTimeValue.toISOString is not a function at dataFormatsTests.js:42 at processQueue (angular.js:14567) at angular.js:14583 at Scope.$get.Scope.$eval (angular.js:15846) at Scope.$get.Scope.$digest (angular.js:15657) at Scope.$get.Scope.$apply (angular.js:15951) at done (angular.js:10364) at completeRequest (angular.js:10536) at XMLHttpRequest.requestLoaded (angular.js:10477)
类型错误：formats.dateTimeValue.toISOString 不是 dataFormatsTests.js:42 at processQueue (angular.js:14567) at angular.js:14583 at Scope.$get.Scope.$eval (angular.js:15846) at Scope.$get.Scope.$digest (angular.js:15657) at Scope.$get.Scope.$apply (angular.js:15951) at done (angular.js:10364) at completeRequest (angular.js:10536) ) 在 XMLHttpRequest.requestLoaded (angular.js:10477)
I've also been to this siteand it says my browser supports the toISOStringfunction.
我也去过这个网站，它说我的浏览器支持该toISOString功能。
So, my questions is: Why doesn't my browser, or angular, or whatever, recognize the toISOStringfunction?
所以，我的问题是：为什么我的浏览器或 angular 或其他任何东西都无法识别该toISOString功能？
回答by JB123
Although the dateTimeValue was defined as a Date in TypeScript, it was being instantiated at runtime as a string because it was being pulled from the API. Therefore, the TypeScript would compile just fine, but when the javascript ran it was seeing .toISOString()being called against a string, not a Date.
尽管 dateTimeValue 在 TypeScript 中被定义为日期，但它在运行时被实例化为字符串，因为它是从 API 中提取的。因此，TypeScript 可以很好地编译，但是当 javascript 运行时，它看到的.toISOString()是针对字符串而不是日期调用的。
回答by Alamgir
Moment.js creates a wrapper for the Date object.formats.dateTimeValue is not wrapper object. To get this wrapper object, simply call moment() with one of the supported input types. so convert it like this:
Moment.js 为 Date 对象创建一个包装器。formats.dateTimeValue 不是包装器对象。要获取此包装器对象，只需使用受支持的输入类型之一调用 moment() 即可。所以像这样转换它：
this.dateDisplay = moment(formats.dateTimeValue).toISOString();
I have solved my problem like above.
我已经像上面一样解决了我的问题。
