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我是 TypeScript 的新手。我正在使用 TypeScript 中的 Class,我的代码以前可以正常工作,但现在无法正常工作。它在运行时显示错误。
class NewP { firstName : string; constructor(digit: string){ this.firstName=digit; } greet(){ return "Hi, " + this.firstName; } } let greet = new NewP("Hello");