运行fluttter doctor报错 变量都已配置

[singgl]

![image](https://user-images.githubusercontent.com/26128398/55369499-68190100-5529-11e9-906f-502abaf1fa60.png

Checking Dart SDK version... 无法将“Unblock-File”项识别为 cmdlet、函数、脚本文件或可运行程序的名称。请检查 名称的拼写，如果包括路径，请确保路径正确，然后重试。 所在位置 行:1 字符: 13

• Unblock-File <<<< -Path 'F:\示例\Flutter\flutter/bin/internal/update_dart_sd k.ps1'; & 'F:\示例\Flutter\flutter/bin/internal/update_dart_sdk.ps1'
  • CategoryInfo : ObjectNotFound: (Unblock-File:String) [], Comman dNotFoundException
  • FullyQualifiedErrorId : CommandNotFoundException

Flutter requires PowerShell 5.0 or newer. See https://flutter.io/docs/get-started/install/windows for more. Building flutter tool... Running pub upgrade... 系统找不到指定的路径。 Error Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)