typescript - 如何解决 TS7009 TypeScript 错误？

Question

我是 Typescript 编程的新手。现在我正处于学习阶段。通过在后端控制台中收到错误，我在编码过程中遇到了问题。上面提到的代码是:

function employee(id:number,name:string) { 
   this.id = id 
   this.name = name 
} 

var emp = new employee(123,"Smith") 
employee.prototype.email = "smith@abc.com" 

console.log("Employee 's Id: "+emp.id) 
console.log("Employee's name: "+emp.name) 
console.log("Employee's Email ID: "+emp.email)

输出@浏览器控制台是:

www.ts:10 Employee 's Id: 123
www.ts:11 Employee's name: Smith
www.ts:12 Employee's Email ID: smith@abc.com

Node控制台的错误是:

[0] www/www.ts(6,15): error TS7009: 'new' expression, whose target lacks
a construct signature, implicitly has an 'any' type.

请帮我解决这个错误。谢谢....

Answer 1

在 TypeScript 中，你应该只在类上使用 new。考虑像这样重写它:

class Employee {
    id: number;
    name: string;
    email: string;

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

let emp = new Employee(123,"Smith");
emp.email = "smith@abc.com";

我不明白你试图通过原型(prototype)属性分配实现什么。