1.打包优化 --report npm run build --report 两个-

// 根目录创建vue.config.js
module.exports = {
  configureWebpack: {
    externals: {
      vue: "Vue",
      "vue-router": "VueRouter",
      vant: "vant"
    }
  }
};

2.页面刷新404

// experss 操作
var history = require('connect-history-api-fallback');
app.use(history());

// nginx 配置
server {
        listen       8080;
        server_name  itsse.cn;
        root /app;
        index index.php index.html index.htm;
        try_files $uri $uri/ /index.html;  // 解决页面刷新404问题
    }

或者
server {
      listen 8080;
     server_name itsse.cn;
     location / {
         root /app;
        index index.php index.html index.htm;
        try_files $uri $uri/ /index.html; // 解决页面刷新404问题
   }
 }