TypeScript 属性装饰器 : access to other properties

Question

我有一个类点是这样的:

class Point {
    @test('admin') x: number = 6

    y: number = 5
}

使用测试装饰器:

function test(myValue: string) {
    function t(target: Object, propertyKey: string, descriptor: 
    TypedPropertyDescriptor<any>) {
        //want to test y value > x value 
    }
return <any>t
}

在我的测试中，我想检查 y 值，例如如果 x < y 会抛出错误

这可能吗？

Answer 1

您的问题类似于this one .

You don't have the context of a specific object instance inside the decorator method. The parameters are the following (from https://www.typescriptlang.org/docs/handbook/decorators.html):

Either the constructor function of the class for a static member, or the prototype of the class for an instance member.

The name of the member.

The Property Descriptor for the member.