如何在 TypeScript 中为“Date”数据类型创建扩展方法
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How to create an extension method in TypeScript for 'Date' data type
提问by AhammadaliPK
I have tried to create an extension method in TypeScript based on this discussion (https://github.com/Microsoft/TypeScript/issues/9), but I couldn't create a working one.
我曾尝试基于此讨论 ( https://github.com/Microsoft/TypeScript/issues/9)在 TypeScript 中创建一个扩展方法，但我无法创建一个有效的方法。
Here is my code,
这是我的代码，
namespace Mynamespace {
interface Date {
ConvertToDateFromTS(msg: string): Date;
}
Date.ConvertToDateFromTS(msg: string): Date {
//conversion code here
}
export class MyClass {}
}
but its not working.
但它不工作。
回答by Nitzan Tomer
You need to change the prototype:
您需要更改原型：
interface Date {
ConvertToDateFromTS(msg: string): Date;
}
Date.prototype.ConvertToDateFromTS = function(msg: string): Date {
// implement logic
}
let oldDate = new Date();
let newDate = oldDate.ConvertToDateFromTS(TS_VALUE);
Though it looks like you want to have a static factory method on the Dateobject, in which case you better do something like:
虽然看起来您希望在Date对象上有一个静态工厂方法，但在这种情况下，您最好执行以下操作：
interface DateConstructor {
ConvertToDateFromTS(msg: string): Date;
}
Date.ConvertToDateFromTS = function(msg: string): Date {
// implement logic
}
let newDate = Date.ConvertToDateFromTS(TS_VALUE);
