koa2獲取圖片並返回，設置靜態文件目錄，訪問本地文件

const Koa = require( 'koa'); const app = new Koa(); // const path = require('path'); // const fs = require('fs'); // // x-response-time // app.use(async (ctx, next) => { // const start = Date.now(); /

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