flutter version列出所有版本
flutter version + 指定版本 :flutter version v1.7.8+hotfix4
flutter channel 列出当前所有渠道稳定版,开发版等
flutter channel + 指定渠道 : flutter channel stable
flutter version列出所有版本
flutter version + 指定版本 :flutter version v1.7.8+hotfix4
flutter channel 列出当前所有渠道稳定版,开发版等
flutter channel + 指定渠道 : flutter channel stable