错误提示如下(在部署之前已经点击了“安装依赖”并提示安装成功):
module.js:487 throw err; ^ Error: Cannot find module 'koa-static' at Function.Module._resolveFilename (module.js:485:15) at Function.Module._load (module.js:437:25) at Module.require (module.js:513:17) at require (internal/module.js:11:18) at Object.&