Introduction to vue server-side rendering page caching and component caching (code)-JS Tutorial-php.cn

Introduction to vue server-side rendering page caching and component caching (code)

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Release： 2018-09-15 15:38:48

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This article brings you an introduction (code) about vue server-side rendering page caching and component caching. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Vue cache is divided into page cache, component cache, and interface cache. Here I mainly talk about page cache and component cache.

Page cache:

In the server. Set

const LRU = require(&#39;lru-cache&#39;)
const microCache = LRU({
  max: 100, // 最大缓存的数目
  maxAge: 1000 // 重要提示：条目在 1 秒后过期。
})

const isCacheable = req => {
  //判断是否需要页面缓存
　　if (req.url && req.url === &#39;/&#39;) {
 　　 return req.url
　　} else {
 　　return false
　　}
}
app.get(&#39;*&#39;, (req, res) => {
const cacheable = isCacheable(req)
　　if (cacheable) {
　　　　const hit = microCache.get(req.url)
 　　　　if (hit) {
    　　return res.end(hit)
　　}
　}
const errorHandler = err => {
  if (err && err.code === 404) {
    // 未找到页面
    res.status(404).sendfile(&#39;public/404.html&#39;);
  } else {
    // 页面渲染错误
    res.status(500).end(&#39;500 - Internal Server Error&#39;)
    console.error(`error during render : ${req.url}`)
    console.error(err)
  }
}
const context = {
  title: &#39;vue&#39;,
  keywords: &#39;vue-ssr服务端脚手架&#39;,
  description: &#39;vue-ssr-template, vue-server-renderer&#39;,
  version: v,
  url: req.url,
  cookies: req.cookies
}
renderer.renderToString(context, (err, html) => {
  if (err) {
    return errorHandler(err)
  }
  res.end(html)
  microCache.set(req.url, html) // 设置当前缓存页面的内容
})
})

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in js to build cache:

Set as follows in server.js:

function createRenderer(bundle, template) {
  return require(&#39;vue-server-renderer&#39;).createBundleRenderer(bundle, {
    template,
    cache: LRU({
      max: 1000,
      maxAge: 1000 * 60 * 5 // 组建缓存时间
    })
  })
}
let renderer
if (isProd) {
  // 生产环境使用本地打包文件来渲染
  const bundle = require(&#39;./output/vue-ssr-bundle.json&#39;)
  const template = fs.readFileSync(resolve(&#39;./output/index.html&#39;), &#39;utf-8&#39;)
  renderer = createRenderer(bundle, template)
} else {
  // 开发环境使用webpack热更新服务
  require(&#39;./build/dev-server&#39;)(app, (bundle, template) => {
    renderer = createRenderer(bundle, template)
  })
}

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The components to be cached

export default {
  name: &#39;Home&#39;,
  title() {
    return {
      title: &#39;vue-ssr&#39;,
      keywords: &#39;vue-ssr服务端脚手架, home&#39;,
      description: &#39;vue-ssr-template, vue-server-renderer, home&#39;
    }
  },
  created() {
  },
  computed: {},
  asyncData({ store }) {},
  methods: {},
  serverCacheKey: props => props.id
}

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serverCacheKey The key returned Should contain enough information to represent the specifics of the rendering result. The above is a good implementation if the rendering result is determined only by props.item.id . However, if you have the same The item id may change over time, or if the rendering result depends on other prop, you need to modify the implementation of serverCacheKey to consider other variables. If serverCacheKey returns a constant, it will cause the component to always be cached, which is good for purely static components.

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