vscode自動產生的launch.json是有問題的，要修改

{
  "version": "0.2.0", "configurations": [ { "name": "Launch", "type": "node", "request": "launch", "program": "${workspaceRoot}/app.js", //這個配置成你要調試的文件"stopOnEntry": false, "args": [ ], "cwd": "${workspaceRoot}/.", "runtimeExecutable": null, "runtimeArgs": [ "--nolazy" ], "env": { "NODE_ENV": "development" }, "console": false, "preLaunchTask": "", "sourceMaps": false, "outFiles": null }, { "name": "Attach", "type": "node", "request": "attach", "port": 5858 } ] }