Please install the "Desktop development with C " workload, including all of

运行flutter doctor：

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v1.18.0-6.0.pre.80, on Microsoft Windows [Version 10.0.18363.720], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[X] Visual Studio - develop for Windows
    X Visual Studio not installed; this is necessary for Windows development.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including the following components:
        MSBuild
        MSVC v142 - VS 2019 C++ x64/x86 build tools
         - If there are multiple build tool versions available, install the latest
        Windows 10 SDK (10.0.17763.0)
[√] Android Studio (version 3.6)
[!] IntelliJ IDEA Ultimate Edition (version 2019.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] Connected device (1 available)

可以看出来，需要下载Visual Studio：里面有提示下载的地址：visualstudio.microsoft.com/downloads/

然后安装 "Desktop development with C++" ，要注意的是： Windows 10 SDK (10.0.17763.0) ，需要下载的是10.0.17763.0这个版本的。因为默认下载的是其他版本的sdk，所以勾选的时候，需要注意选择。 MSBuild  MSVC v142 - VS 2019 C++ x64/x86 build tools 这2个是默认就有选择的。

再次运行flutter doctor，就说明flutter支持windows应用就好了。

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v1.18.0-6.0.pre.80, on Microsoft Windows [Version 10.0.18363.720], locale zh-CN)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Visual Studio - develop for Windows (Visual Studio Enterprise 2019 16.5.4)
[√] Android Studio (version 3.6)
[!] IntelliJ IDEA Ultimate Edition (version 2019.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] Connected device (1 available)