按住F1，打开c_cpp_properties.json配置文件：

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**",
                "/home/huangruolan/repos/ns-3-allinone/ns-3-dev/build"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "gnu17",
            "cppStandard": "gnu++17",
            "intelliSenseMode": "linux-gcc-x64",
            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
        }
    ],
    "version": 4
}

红色字体为头文件位置，在linux系统中打开头文件夹，输入pwd获取路径