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
}