首先创建tasks.json文件，用于编译项目。

1、自己先新建一个 .vscode 文件夹，然后command+shift+p 弹出任务框，选择Tasks:Configure Task，生成tasks.json，tasks.json 是用来配置编译所需的相关参数。

{
	"version": "2.0.0",
	"tasks": [
		{
			"type": "cppbuild",
			"label": "C/C++: clang 生成活动文件",
			"command": "/usr/bin/g++",
			"args": [
				"-fdiagnostics-color=always",
				"-g",
				"-std=c++11",
				"${file}",
				"-o",
				"${fileDirname}/${fileBasenameNoExtension}"
			],
			"options": {
				"cwd": "${fileDirname}"
			},
			"problemMatcher": [
				"$gcc"
			],
			"group": "build",
			"detail": "编译器: /usr/bin/clang"
		}
	]
}

2、然后再创建一个 launch.json 文件， 用于加载taks.json任务并编译项目，然后调试

launch.json 具体配置如下，（要调试的程序 编译时必须有"-g"参数，用于添加调试信息）

{
    // 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": [
        {
            "name": "g++ - 生成和调试活动文件",
            "type": "cppdbg",
            "request": "launch",
            //"request":"attach",
            "program": "${workspaceFolder}/main",
            //"args": ["-c" ,"${workspaceFolder}/trunk/conf/srs.conf"],
            "stopAtEntry": false,  
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "lldb",
           "setupCommands": [
            {
            "description": "Enable pretty-printing for gdb",
            "text": "-enable-pretty-printing",
            "ignoreFailures": true
            }
            ],
            //"preLaunchTask": "C/C++: clang 生成活动文件" // 调试之前要执行的任务，和tasks.json中的label必须相同
        }
    ]
   
}

然后就可以运行---》启动调试了