angular报错：Property ‘selectedHe‘ has no initializer and is not definitely assigned in the constructor

程序开发 2023-09-03 17:15:50

或者这个报错：Refused to load the image’http://localhost:4200/favicon.ico’ because it violates the following Content Security Policy directive: “default-src ‘none’”. Note that ‘img-src’ was not explicitly set, so ‘default-src’ is used as a fallback.

在这里插入图片描述
在报错地方如上图：加上感叹号：selectedHero!: Hero;或者加问号：selectedHero?: Hero;