vue first loading slow optimization

Currently using vue2 version
1. Routing lazy loading (on-demand loading)

 component: resolve => require(['@/views/physicalDetail/index'], resolve)

2. gzip compression plug-in (requires operation and maintenance nginx to cooperate)

• The first step, download compression-webpack-plugin

cnpm i [email protected] --save

Note that you cannot download directly here, you need to download a lower version. Direct download is the latest version. Vue scaffolding does not support the latest version for the time being, so an error will be reported: TypeError: Cannot read property 'tapPromise' of undefined. My download here is to specify the @6.1.1 version, which is available

• In the second step, vue.config.js uses

const CompressionPlugin = require('compression-webpack-plugin');//引入gzip压缩插件

// 暴露配置项，会被合并到webpack中去
module.exports = {
    chainWebpack(config) {
        // ......
    },
    configureWebpack: config => {
        // 开发环境不配置
        if (process.env.NODE_ENV !== 'production') return
        // 生产环境才去配置
        return {
            plugins: [
                new CompressionPlugin({ //此插件不能使用太高的版本，否则报错：TypeError: Cannot read property 'tapPromise' of undefined
                    // filename: "[path][base].gz", // 这种方式是默认的，多个文件压缩就有多个.gz文件，建议使用下方的写法
                    filename: '[path].gz[query]', //  使得多个.gz文件合并成一个文件，这种方式压缩后的文件少，建议使用
                    algorithm: 'gzip', // 官方默认压缩算法也是gzip
                    test: /\.js$|\.css$|\.html$|\.ttf$|\.eot$|\.woff$/, // 使用正则给匹配到的文件做压缩，这里是给html、css、js以及字体（.ttf和.woff和.eot）做压缩
                    threshold: 10240, //以字节为单位压缩超过此大小的文件，使用默认值10240吧
                    minRatio: 0.8, // 最小压缩比率，官方默认0.8
                    //是否删除原有静态资源文件，即只保留压缩后的.gz文件，建议这个置为false，还保留源文件。以防：
                    // 假如出现访问.gz文件访问不到的时候，还可以访问源文件双重保障
                    deleteOriginalAssets: false
                })
            ]
        }
    },
};

• Back-end nginx configuration (the code below, just copy and paste to use)

server {
    listen       80;
    server_name  localhost;
    location / {
        try_files $uri $uri/ /index.html;
        root C:/nginx-1.18.0/html/gzip/dist;
        index  index.html index.htm;
    }
    location /api/ {
        proxy_pass http://localhost:6666/;
    }
    
    # 主要是下方的gizp配置哦，直接复制粘贴就可以使用啦，亲测有效哦
    gzip on; # 开启gzip压缩
    gzip_min_length 4k; # 小于4k的文件不会被压缩，大于4k的文件才会去压缩
    gzip_buffers 16 8k; # 处理请求压缩的缓冲区数量和大小，比如8k为单位申请16倍内存空间；使用默认即可，不用修改
    gzip_http_version 1.1; # 早期版本http不支持，指定默认兼容，不用修改
    gzip_comp_level 2; # gzip 压缩级别，1-9，理论上数字越大压缩的越好，也越占用CPU时间。实际上超过2的再压缩，只能压缩一点点了，但是cpu确是有点浪费。因为2就够用了
             # 压缩的文件类型 MIME类型，百度一下，一大把                                    # css             # xml             # 识别php     # 图片
    gzip_types text/plain application/x-javascript application/javascript text/javascript text/css application/xml application/x-httpd-php image/jpeg image/gif image/png application/vnd.ms-fontobject font/x-woff font/ttf;
             # text                   # 早期js                 # js        # js的另一种写法                                                                                 # .eot字体                   # woff字体  # ttf字体
    gzip_vary on; # 是否在http header中添加Vary: Accept-Encoding，一般情况下建议开启       
}

If gzip compression is enabled, in the http request, you can also see that the response header has Content-Encoding: gzip, which is not available if gzip compression is not enabled. As shown in the figure below:

3. Check the place where the package occupies a large amount of memory (there will be a report.html file, open it and you will see the occupied size)

npm run build -- --report

4. When vue uses svg, use vue-svg-icon to load on demand. If you use svg-sprite-loader, all svg files will be loaded for the first time, which will also cause slow loading

Reference document: https://www.npmjs.com/package/vue-svg-icon/v/1.2.9#chineseversion

• npm install vue-svg-icon --save-dev
• main.js

import Icon from 'vue-svg-icon/Icon.vue';
Vue.component('icon', Icon);  

• use

<icon name="chameleon" :scale="20"></icon>

The svg coordinates generated by Alibaba need to be used, so the svg downloaded on Blue Lake needs to be uploaded and transferred to Alibaba
https://www.iconfont.cn/icons/upload?spm=a313x.7781069.1998910419.d059fa781

Reminds me of a quote by Haruki Murakami:

"I'm not ready to be 20 years old at all. I'm very puzzled, as if someone pushed me from behind." I thought I was in my 20s, and I would go to see the mountains, rivers and seas, and the afterglow of the sunset. But the truth is, I'm still looking for myself.