How to use JS to achieve front-end and back-end isomorphism
This time I will show you how to use JS to achieve front-end and back-end isomorphism. What are the precautions for using JS to achieve front-end and back-end isomorphism? The following is a practical case, let’s take a look.
What is front-end and back-end isomorphism
Clear three concepts: "Back-end rendering" refers to the traditional ASP, Java or PHP rendering mechanism; "Front-end rendering" It refers to using JS to render most of the content of the page, which represents the now popular SPA single-page application; "isomorphic rendering" refers to the front-end and back-end sharing JS, and It feels like the front-end is really a toss-up. Separation of front-end and back-end was popular before. Why do we need to make front-end and back-end isomorphism now? The reason is that the popular SPA front-end single-page application is relatively heavy and requires a lot of files to be loaded for the first visit. The first load is too slow and the user needs to wait for the front-end to render the page. It is not conducive to SEO and caching, and has certain development thresholds. By reusing templates and JS files, the front-end and back-end isomorphism allows a code to run on the server and browser at the same time. For the first rendering, use nodejs to render the page, and then use SPAProject Introduction
This front-end and back-end isomorphic project is mainly divided into two parts, one is a rendering server based on koa2, and the other is based on native JS and zepto Front-end SPA. The project is characterized by not using frameworks such as vue and react, low threshold, fast development speed, easy to get started, relatively lightweight, and the core router part only has about a hundred lines of code. It is suitable for scenarios where there are few page interactions and infrequent changes, and can effectively improve performance and loading speed.Front-end part
The core of the front-end part is the routing part. The specific implementation can be based on history API or hash. There are many implementations on the Internet. This time we mainly talk about the architectureThe front-end part adopts MVC hierarchical structure.
Form such as:
import control from '../control'
//路由的构造函数支持传入渲染函数，路由的全局名称，路由跳转前调用的钩子
router = new Router(render,'ROUTER',beforeFn)
router.get('/page/a', control.pageA')
let control = {
pageA(req,res) {
//webpack的动态加载，代码分割功能
import(/* webpackChunkName: "pageA" */'script/pageA').then(module=> {
// 检测该页面是否已有服务器渲染好，是的话直接运行module.default
//否则加载模板和数据进行渲染,最后再调用页面函数
if(this.needRender(module.default)) {
//加载数据时访问的地址就是当前准备渲染的页面地址，只是加上了json=1的参数
loadData('pageA').then(data =>
res.render(xtpl,data,module.default))
}
}
}
// 捕捉webpack热更新，让他只进行相当于页面跳转的操作而不是刷新页面
if(module.hot) {
module.hot.accept(['script/pageA'], () => {
control[ROUTER.req.currentControl].call(ROUTER,null,ROUTER.res)
})
}The form of the page function
page The function requires the use of es6 module writing and the on-demand loading function of webpackexport default () => {
window.addEventListener('scroll', fn)
//页面函数支持返回一个卸载函数，在页面离开的时候会被调用
//主要用于内存的释放，定时器的清除，事件监听的移除等等
return function () {
window.removeEventListener('scroll', fn)
}
}How to declare JS variables var,let.const
How to use vue to calculate properties and methods Listener
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