Also aus irgendeinem Grund wird meine txt-Eigenschaft in meiner einfachen App nicht reagieren. mein Code in App.js Datei Dies ist:Reagieren nicht Rendern propagieren?
import React from 'react';
import ReactDOM from 'react-dom';
class App extends React.Component {
render() {
return <h1> {this.props.txt}</h1>
}
}
ReactDOM.render(<App txt="Hello world"/>, document.getElementById('app'))
Dies ist der Fehler, die ich in Chrom-Entwickler-Tools-Konsole erhalten:
index.js:9576 Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).warning @ index.js:9576createElement @ index.js:26847(anonymous function) @ index.js:7558__webpack_require__ @ index.js:20(anonymous function) @ index.js:48__webpack_require__ @ index.js:20(anonymous function) @ index.js:40(anonymous function) @ index.js:43
index.js:8492 Uncaught Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
Welche Version von reagieren, sind Sie mit arbeiten? –