我正在尝试使用 Webpack 设置同构服务器端渲染 React 应用程序,但是当我尝试使用 renderToString 将我的 React 代码转换为字符串时出现此错误:
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).
Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
当我使用 renderToString 函数注释掉该行时,我不再收到此错误(当然,该应用程序仍然无法运行 - 我只是不再收到错误消息)。
我试过传递 renderToString<RootApp />
而React.createElement(RoutingContext
不是制造工厂,但这些都没有奏效。UsingReact.createElement
导致了同样的错误,并且 using<RootApp />
抛出了一个unexpected token < error
.
以及对可能发生的事情的想法?
我的应用看起来像:
应用程序.js
"use strict"
require("babel-register");
const Express = require('express');
const BodyParser = require('body-parser');
const Path = require('path');
const Fs = require('fs');
const Url = require('url');
const ReactRouter = require('react-router');
const React = require('react');
const ReactDOMServer = require('react-dom/server');
const app = Express();
app.set('view engine', 'ejs');
app.get('*', (req, res) => {
let RootApp = require('./components/app.jsx');
let rootAppFactory = React.createFactory(RootApp);
let reactHtml = ReactDOMServer.renderToString(rootAppFactory({}));
res.render('index', {reactOutput: reactHtml});
})
if (process.env.NODE_ENV !== 'test') {
let port = process.env.port || 4000;
app.listen(port);
console.log('Listening on port', port);
} else {
module.exports = app;
}
应用程序.jsx
import React, {Component} from 'react';
import ReactDOM from 'react-dom';
class App extends Component {
render() {
return (
<div>
{this.props.children}
</div>
)
}
}
export default App;
索引.ejs
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<title>Vjeverica</title>
</head>
<body>
<div id="root">
<%- reactOutput %>
</div>
<script src="bundle.js"></script>
</body>
</html>