Javascript ReactJS是否为服务器端渲染的应用程序渲染应用程序两次?(重复代码)
在服务器端渲染中,结构是否要求我们渲染应用程序两次?在如下所示的server.js文件中,呈现应用程序结构并将其发送到客户端。虽然完整代码是由Server.js生成的,Client.js通过调用render函数再次生成的 据我所知,应用程序的最终结构是: SERVER.js(呈现HTML,获取初始状态并将其设置在预加载的_state变量中,使用renderFullPage函数呈现页面) ==> CLIENT.js(使用预加载状态变量呈现应用程序结构 如果我错了,请纠正我。如果不是,我们就不能做一次吗 Server.jsJavascript ReactJS是否为服务器端渲染的应用程序渲染应用程序两次?(重复代码),javascript,node.js,reactjs,server-side-rendering,Javascript,Node.js,Reactjs,Server Side Rendering,在服务器端渲染中,结构是否要求我们渲染应用程序两次?在如下所示的server.js文件中,呈现应用程序结构并将其发送到客户端。虽然完整代码是由Server.js生成的,Client.js通过调用render函数再次生成的 据我所知,应用程序的最终结构是: SERVER.js(呈现HTML,获取初始状态并将其设置在预加载的_state变量中,使用renderFullPage函数呈现页面) ==> CLIENT.js(使用预加载状态变量呈现应用程序结构 如果我错了,请纠正我。如果不是,我们就不能做一
import path from 'path'
import Express from 'express'
import React from 'react'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import counterApp from './reducers'
import App from './containers/App'
import { renderToString } from 'react-dom/server'
const app = Express()
const port = 3000
// This is fired every time the server side receives a request
app.use(handleRender)
// We are going to fill these out in the sections to follow
function handleRender(req, res) { /* ... */ }
function renderFullPage(html, preloadedState) { /* ... */ }
app.listen(port)
function handleRender(req, res) {
// Create a new Redux store instance
const store = createStore(counterApp)
// Render the component to a string
const html = renderToString(
<Provider store={store}>
<App />
</Provider>
)
// Grab the initial state from our Redux store
const preloadedState = store.getState()
// Send the rendered page back to the client
res.send(renderFullPage(html, preloadedState))
}
function renderFullPage(html, preloadedState) {
return `
<!doctype html>
<html>
<head>
<title>Redux Universal Example</title>
</head>
<body>
<div id="root">${html}</div>
<script>
window.__PRELOADED_STATE__ = ${JSON.stringify(preloadedState)}
</script>
<script src="/static/bundle.js"></script>
</body>
</html>
`
}
import React from 'react'
import { render } from 'react-dom'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import App from './containers/App'
import counterApp from './reducers'
// Grab the state from a global injected into server-generated HTML
const preloadedState = window.__PRELOADED_STATE__
// Create Redux store with initial state
const store = createStore(counterApp, preloadedState)
render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('root')
从“路径”导入路径
从“Express”导入Express
从“React”导入React
从“redux”导入{createStore}
从“react redux”导入{Provider}
从“./reducers”导入计数器应用程序
从“./containers/App”导入应用程序
从'react dom/server'导入{renderToString}
const app=Express()
常数端口=3000
//每次服务器端收到请求时,都会触发此操作
应用程序使用(handleRender)
//我们将在下面的章节中填写这些内容
函数handleRender(req,res){/*…*/}
函数renderFullPage(html,preload状态){/*…*/}
应用程序侦听(端口)
功能手柄器(要求,res){
//创建一个新的Redux存储实例
const store=createStore(计数器应用程序)
//将组件渲染为字符串
常量html=renderToString(
)
//从我们的Redux商店获取初始状态
const preload state=store.getState()
//将呈现的页面发送回客户端
res.send(renderFullPage(html,preload状态))
}
函数renderFullPage(html,preload状态){
返回`
Redux通用示例
${html}
窗口。\uuuu预加载\u状态\uuuu=${JSON.stringify(预加载状态)}
`
}
Client.js
import path from 'path'
import Express from 'express'
import React from 'react'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import counterApp from './reducers'
import App from './containers/App'
import { renderToString } from 'react-dom/server'
const app = Express()
const port = 3000
// This is fired every time the server side receives a request
app.use(handleRender)
// We are going to fill these out in the sections to follow
function handleRender(req, res) { /* ... */ }
function renderFullPage(html, preloadedState) { /* ... */ }
app.listen(port)
function handleRender(req, res) {
// Create a new Redux store instance
const store = createStore(counterApp)
// Render the component to a string
const html = renderToString(
<Provider store={store}>
<App />
</Provider>
)
// Grab the initial state from our Redux store
const preloadedState = store.getState()
// Send the rendered page back to the client
res.send(renderFullPage(html, preloadedState))
}
function renderFullPage(html, preloadedState) {
return `
<!doctype html>
<html>
<head>
<title>Redux Universal Example</title>
</head>
<body>
<div id="root">${html}</div>
<script>
window.__PRELOADED_STATE__ = ${JSON.stringify(preloadedState)}
</script>
<script src="/static/bundle.js"></script>
</body>
</html>
`
}
import React from 'react'
import { render } from 'react-dom'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import App from './containers/App'
import counterApp from './reducers'
// Grab the state from a global injected into server-generated HTML
const preloadedState = window.__PRELOADED_STATE__
// Create Redux store with initial state
const store = createStore(counterApp, preloadedState)
render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('root')
从“React”导入React
从'react dom'导入{render}
从“redux”导入{createStore}
从“react redux”导入{Provider}
从“./containers/App”导入应用程序
从“./reducers”导入计数器应用程序
//从注入服务器生成的HTML的全局文件中获取状态
常量预加载状态=窗口。\预加载状态__
//使用初始状态创建Redux存储
const store=createStore(计数器应用程序,预加载状态)
渲染(
,
document.getElementById('root'))
答案取决于两次渲染的含义。React将比较服务器中生成的节点与虚拟DOM中生成的节点的数据校验和,以验证它们是否与客户端中生成的节点相同。这样就不需要修改DOM,只需修改虚拟DOM即可
从:
如果在已经具有此服务器呈现标记的节点上调用ReactDOM.render(),React将保留它,并仅附加事件处理程序,从而使您能够获得非常出色的首次加载体验
编辑:我错误地写下要比较的数据是reactId而不是checksum