求助排查：Cannot read property 'keyboard' of undefined报错

你遇到的错误根源是：SearchPage类中的searchKeyboard属性仅声明了类型，但从未被实例化为SearchKeyboardModel的对象，导致this.searchKeyboard的值为undefined，自然无法读取它的keyboard属性。

修复方案 #

只需在SearchPage中完成searchKeyboard的实例化即可，有两种实现方式：

方式1：在构造函数中实例化

class SearchPage extends BasePage {
  searchKeyboard: SearchKeyboardModel;

  constructor() {
    super();
    // 实例化SearchKeyboardModel对象
    this.searchKeyboard = new SearchKeyboardModel();
  }

  async enterSearchKeyword(keyword: string) {
    await t.expect(this.searchKeyboard.keyboard.visible).ok({ timeout: 3000 });
  }
}

方式2：直接在属性声明时实例化

class SearchPage extends BasePage {
  // 直接初始化实例
  searchKeyboard: SearchKeyboardModel = new SearchKeyboardModel();

  constructor() {
    super();
  }

  async enterSearchKeyword(keyword: string) {
    await t.expect(this.searchKeyboard.keyboard.visible).ok({ timeout: 3000 });
  }
}

实例化后，this.searchKeyboard会成为SearchKeyboardModel的有效对象，其keyboard属性会被正确初始化为目标选择器，后续访问this.searchKeyboard.keyboard.visible就不会再触发undefined相关错误。

内容的提问来源于stack exchange，提问作者BruceyBandit