在package.json中添加调试脚本：

"scripts": {
.......
    "debug": "node --inspect node_modules/serverless/bin/serverless offline -s dev",
.........
}

VS代码lunch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "cwd": "${workspaceFolder}",
      "name": "Serverless",
      "runtimeExecutable": "npm",
      "runtimeArgs": [
        "run",
        "debug"
      ],
      "port": 9229
    }
  ]
}

然后从VS代码开始调试

您看到的警告是弃用警告;自Node 7.7.0起，旧版调试器（--debug）已弃用。将节点调试器附加到无服务器脱机的正确方法是使用--inspect：

node --inspect $(npm bin)/sls offline start

如果你有一个JSON格式的有效示例事件，并且你可以一次调试一个函数，那么下面的配置对我来说非常有效，它完全按照你的期望启用断点和单步调试：

{
      "type": "node",
      "request": "launch",
      "cwd": "${workspaceFolder}",
      "name": "sls invoke local: myFunction",
      "runtimeExecutable": "sls",
      "runtimeArgs": [
        "invoke",
        "local",
        "-f",
        "loadOptions",
        "-p",
        "activities/myFunction/myFunction-event.json"
      ],
    },