📜 core.js:6479 错误类型错误：无法读取未定义的属性(读取“名称”) - Javascript 代码示例
📅 最后修改于: 2022-03-11 15:02:57.533000 🧑 作者: Mango
代码示例1
The serive.book property is undefined because it doesn't have
an initial value. So in your service, just initialize
the book property like the following:
book: Book = new Book();