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.
在报错地方如上图：加上感叹号：selectedHero!: Hero;或者加问号：selectedHero?: Hero;
修改后
前者是指我们不确定是否会传入这个参数，后者是指我们一定会给这个参数赋值
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angular报错：Property ‘selectedHe‘ has no initializer and is not definitely assigne
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