Question

我尝试使用服务器端渲染构建ReactJs应用程序我的客户端和服务器入口点：

const store = createStore(window.__INITIAL_STATE__);

hydrate(
  <Provider store={store}>
    <BrowserRouter>{renderRoutes(routes)}</BrowserRouter>
  </Provider>,
  document.querySelector('#root')
);

server.jsx

const app = express();

if (isDev) {
  const webpack = require('webpack');
  const webpackDevMiddleware = require('webpack-dev-middleware');
  const config = require('../../webpack.config.js');
  const compiler = webpack(config);

  app.use(express.static('/public'));
  app.use(
    webpackDevMiddleware(compiler, {
      publicPath: config.output.publicPath,
      stats: 'errors-only',
    })
  );
}

app.get('*', (req, res) => {
  const helmet = Helmet.renderStatic();
  const htmlAttrs = helmet.htmlAttributes.toComponent();
  const bodyAttrs = helmet.bodyAttributes.toComponent();

  const context = {};
  const data = {};

  res.set('content-type', 'text/html');

  res.send(
    '<!DOCTYPE html>' +
      renderToString(
        <html {...htmlAttrs}>
          <head>
            {helmet.title.toComponent()}
            {helmet.meta.toComponent()}
            {helmet.link.toComponent()}
          </head>
          <body {...bodyAttrs}>
            <div id="root">
              <StaticRouter location={req.url} context={context}>
                {renderRoutes(routes)}
              </StaticRouter>
            </div>
            <script
              dangerouslySetInnerHTML={{
                __html: `window.__INITIAL_STATE__ = ${JSON.stringify(data)}`,
              }}
            />
            <script src="/public/vendor.js" />
            <script src="/public/app.js" />
          </body>
        </html>
      )
  );
});

和组件：

home.jsx

import React, { Component } from 'react';

class Home extends Component {
  render() {
    return <div>home</div>;
  }
}

export default Home;

当我更改我的组件Home并刷新浏览器页面时，我收到此错误：

警告：文字内容不匹配。服务器：＆＃34; home＆＃34;客户：＆＃34; home1＆＃34;

它可以，因为服务器渲染我的代码的旧版本。如何在服务器上重新加载代码以使客户端和服务器版本相同？

Answer 1

如果发现此错误是因为您的客户端和服务器故意呈现不同的内容（例如服务器呈现深色主题，但在加载时会被用户偏好替换），请使用 suppressHydrationWarning 抑制错误。

例如：

<div suppressHydrationWarning>Ignore this</div>

Answer 2

这里的问题是您的服务器端应用程序未反映代码更改。为此，您必须将Express应用程序配置为Webpack条目。

简而言之，您需要2个Webpack配置，一个用于服务器，另一个用于客户端代码。服务器一个看起来像这样

module.exports = {
  entry: {
    server: './server.js',
  },
  output: {
    path: path.join(__dirname, 'dist'),
    publicPath: '/',
    filename: '[name].js'
  },
  target: 'node',
  node: {
    // Need this when working with express, otherwise the build fails
    __dirname: false,   // if you don't put this is, __dirname
    __filename: false,  // and __filename return blank or /
  },
  externals: [nodeExternals()], // Need this to avoid error when working with Express
  module: {
    rules: [
      {
        // Transpiles ES6-8 into ES5
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        // Loads the javacript into html template provided.
        // Entry point is set below in HtmlWebPackPlugin in Plugins 
        test: /\.html$/,
        use: [{loader: "html-loader"}]
      }
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: "./index.html",
      filename: "./index.html",
      excludeChunks: [ 'server' ]
    })
  ]
}

这里是nice article，详细说明了如何实现

文字内容不匹配。 React 16中的警告

2 个答案: