错误信息是
refused to load the image 'http://localhost:9000/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.
引入header组件后再次cnpm start就这样了,除此外没有别的错误信息,代码都是跟着敲的