react 首屏性能优化

首屏优化点:1.加载包(bundle.js)文件的大小,越小,首屏渲染速度越快 (按需加载)css

      2.优先渲染用户直观看到的页面部分(懒加载)react

 

技术点:react-loadable 、 react-lazyloadnpm

 

import React,{Component} from "react"
import {Link} from "react-router-dom" import LazyLoad from 'react-lazyload'; //懒加载依赖 import Diag from "../component/diag" //懒加载占位组件 import Loadable from 'react-loadable'; //按需加载依赖
import "../static/css/page2.scss"

const Loading = () => <div>Loading...</div>;

const Imgshow = Loadable({ //按需加载模块配置 loader: () => import("../component/imgshow"), loading:Loading, }); class B extends Component{
    state={
        pics:[
            require("../static/imgs/link.jpg"),
            require("../static/imgs/link1.jpg"),
            require("../static/imgs/link2.jpg"),
            require("../static/imgs/link3.jpg"),
            require("../static/imgs/link4.jpg"),
            require("../static/imgs/link5.jpg"),
            require("../static/imgs/link6.jpg"),
            require("../static/imgs/link7.jpg"),
            require("../static/imgs/link8.jpg"),
        ]
    };
    render(){
        return (
            <div>
                <ul className="lazyLi">
                    <li style={{height:"600px"}}></li>
                    {this.state.pics.map((item,index)=><li  key={index}>
                        <LazyLoad  height={200} placeholder={<Diag/>} debounce={200}>   //懒加载图片,当页面滚动此位置时,加载Imgshow组件
                            <Imgshow src={item}/>
                        </LazyLoad>
                    </li>)}
                </ul>
            </div>
        )
    }
}
export default B;

滚动前:react-router

滚动后:dom

 多了一个4.chunk.js,页面滚动到此组件位置,采起加载此组件,减少了bundle 的文件大小,配合懒加载使用优化

 

react-lazyload : https://www.npmjs.com/package/react-lazyloadui

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