typescript 错误 : Cannot read property X of undefined

Question

我创建了一个类 Meetings 的实例:

export var meeting: Meetings; //create a meeting instance of Meeting class present into meeting.ts

当我在 Meetings 类上调用名为“meetForMe()”的函数时:

var myMeeting = meeting.meetForMe(email);

我收到这个错误:

Cannot read property 'meetForMe' of undefined

我以这种方式宣布类(class) session :

export class Meetings{....}

Answer 1

对象应该在使用前被创建:

export var meeting = new Meetings();

在您的代码中，您只需声明一个“ session ”类型的变量。