1、打开 VSCode 的设置，可以通过快捷键 Ctrl + Shift + P 打开命令面板，然后搜索并选择 “C/C++: Edit Configurations (JSON)” 命令，这将在 .vscode 文件夹中创建或修改 c_cpp_properties.json 文件

{"configurations": [{"name": "Linux","includePath": ["${workspaceFolder}/**" ],"defines": [],"compilerPath": "/opt/rh/devtoolset-7/root/usr/bin/gcc","cStandard": "c11","cppStandard": "gnu++14","intelliSenseMode": "linux-gcc-x64"}],"version": 4
}

2、在 c_cpp_properties.json 文件中，找到 “includePath” 属性，并添加你的头文件路径。确保在每个路径后面加上 /**，以便 VSCode 能够查找这些目录及其子目录中的头文件

我这里添加了muduo的头文件路径

{"configurations": [{"name": "Linux","includePath": ["${workspaceFolder}/**" ,"/home/cxq/RPC/build/release-install-cpp11/include"],"defines": [],"compilerPath": "/opt/rh/devtoolset-7/root/usr/bin/gcc","cStandard": "c11","cppStandard": "gnu++14","intelliSenseMode": "linux-gcc-x64"}],"version": 4
}