原来的launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Golang",
            "type": "go",
            "request": "launch",
            "program": "${workspaceFolder}",
            "args": []
        }
    ]
}

如果报以下错误：

Couldn’t start dlv dap：
Error：Cannot find Delve debugger (dlv dap)

需要安装github.com/go-delve/delve/cmd/dlv

go版本1.16以上，执行

go install github.com/go-delve/delve/cmd/dlv@latest

1.16以下

go get github.com/go-delve/delve/cmd/dlv

安装完成后就可以DEBUG了