javascript - Typescript 方法装饰器

Question

我有这个代码

function changeFunc() {
    return function(target: any, title: string, descriptor: PropertyDescriptor) {

        descriptor.value = function () {
            console.log(this.name);
        };

        return descriptor;

    }
}


class Man {
    name: string = "asdsds";

    constructor(name: string) {
        this.name = name;
    }

    @changeFunc()
    getName() {
        console.log("Hello");
    }

}


var man = new Man('Manos Serifios');
man.getName();  

换句话说，我尝试(与装饰器)改变方法

getName() {  
    console.log("Hello");  
}  

有了这个

function () {
    console.log(this.name);
}

但是 this.name 被评估为未定义。

如果我控制台记录“this”，那么似乎这是正确的(实例人)。

Answer 1

装饰器方法内没有特定对象实例的上下文。参数如下(来自 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.