2021-05-12 14:32:11
老呂教學--02後端KOA2框架自動重啟編譯服務(nodemon)
2020-12-26 00:00:17
上一篇講完搭建Typescritp版的Koa框架後,F5執行伺服器端,頁面進行正常顯示服務。
今天要分享的是,如果要修改伺服器端程式碼,如果讓編譯服務自動重啟,免去手動結束服務再重啟的過程。
自動重啟服務需要使用nodemon工具。nodemon可以自動檢測到目錄中的檔案更改時,通過重新啟動應用程式來偵錯基於node.js的應用程式。
1. 全域性安裝nodemon
npm i nodemon -g
2. 設定引導檔案lunch.json,修改為如下程式碼
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [{
"type": "node",
"request": "launch",
"name": "Launch Program",
"preLaunchTask": "typescript",
"protocol": "inspector",
"program": "${workspaceFolder}/index.ts",
"outFiles": [
"${workspaceFolder}/bin/*.js"
],
"runtimeExecutable": "npm",
"runtimeArgs": [
"run",
"debug"
],
"port": 5858,
"env": {
"NODE_ENV": "dev"
},
"restart": true,
"console": "integratedTerminal",
"internalConsoleOptions": "neverOpen"
}]
}
3. 修改package.json的scripts,如下:
{ // See https://go.microsoft.com/fwlink/?LinkId=733558 // for the documentation about the tasks.json format "version": "2.0.0", "tasks": [{ "label": "typescript", "type": "typescript", "tsconfig": "tsconfig.json", "isBackground": true, "problemMatcher": "$tsc-watch", "option": "watch" }] }
4. 修改task.json,如下:
"scripts": { "start": "node ./bin/index.js", "debug": "nodemon --watch ./bin --inspect=0.0.0.0:5858 --nolazy ./bin/index.js", "build": "npm run build-ts", "build-ts": "tsc", "watch": "npm run watch-ts", "watch-ts": "tsc -w" }
5. F5執行偵錯,控制檯顯示如下:
6. index.ts如上篇文章內容不變,開啟瀏覽器,輸入地址:localhost:3000,顯示效果如下:
const Koa = require('koa'); const app = new Koa(); app.use(async (ctx: any) => { ctx.body = 'Hello World'; }); console.log('app server start on port 3000...') app.listen(3000);
7. 修改index.ts程式碼,如下:(僅修改:ctx.body = 'Hello World...Hello LaoLv';)
const Koa = require('koa'); const app = new Koa(); app.use(async (ctx: any) => { ctx.body = 'Hello World...Hello LaoLv'; }); console.log('app server start on port 3000...') app.listen(3000);
8. 儲存index.ts,此時控制檯自動編譯輸出內容:
9. 開啟瀏覽器,重新整理,自動更改為修改後的結果,效果如下:
到此,後端偵錯,自動編譯重啟服務的功能完成。
可能F5後vs code會彈出下面問題:Cannot connect to runtime process,timeout after 10000 ms -......
解決辦法就是,launch.json中,一定要加上:"port": 5858,因為此處的port要與package.json中scripts-->debug中的 --inspect 0.0.0.0:5858的埠一致。
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