当我尝试使用React从另一个文件导入类时，为什么会出现空白屏幕

Question

So I'm brand new to the React framework, and I'm running into an issue that I am having trouble debugging.

I am trying to import a class from another component in another file in my project into my app.js. This class does nothing right now but display the text "My Projects" on the page.

When I instantiate it in the app.js using <Projects/> my app goes from displaying the text in the app.js (My App) to a blank white screen.

I'm expecting it to render the text "My App" then "My Projects" on the next line. What am I missing?

Here is the app.js:

import React, { Component } from 'react';
import Projects from './Components/Projects';
import './App.css';

class App extends Component {
 render() {
  return (
  <div className="App">
    My App
    <Projects/>
  </div>
    );
  }
} 

export default App;

And here is the Projects.js:

import React, { Component } from 'react';

class Projects extends Component {
  render() {
    return (
      <div className="Projects">
        My Projects
      </div>
    );
  }
}

export default Projects;

Here is the error coming from the dev console:

invariant.js:44 Uncaught Error: Invalid tag: data:application/octet-stream;base64,aW1wb3J0IFJlYWN0LCB7IENvbXBvbmVudCB9IG…MKICAgICAgPC9kaXY+IAogICAgKTsKICB9Cn0KZXhwb3J0IGRlZmF1bHQgUHJvamVjdHM7Cg==
at invariant (invariant.js:44)
at validateDangerousTag (ReactDOMComponent.js:345)
at new ReactDOMComponent (ReactDOMComponent.js:372)
at Object.createInternalComponent (ReactHostComponent.js:41)
at instantiateReactComponent (instantiateReactComponent.js:79)
at instantiateChild (ReactChildReconciler.js:44)
at ReactChildReconciler.js:71
at traverseAllChildrenImpl (traverseAllChildren.js:77)
at traverseAllChildrenImpl (traverseAllChildren.js:93)
at traverseAllChildren (traverseAllChildren.js:172)

And here's an image of the product structure:

http://imgur.com/a/BKTK3

Answer 1

Because you saved code for Projects component in a file without .js extension, it was loaded as a text file. Since the text starts with lowercase letter data:application... it is treated as a custom element with invalid name, hence Invalid tag error.