1, 使用Grunt 进行 Karma 测试任务是出现 

    Please set env variable CHROME_BIN 错误时

 在命令行输入 

SET CHROME_BIN=C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

设置临时环境变量或添加 CHROME_BIN 到 系统环境变量中去即可解决.(有一些情况下, 添加系统环境变量后没有立即生效, 重新打开命令行/注销系统重启可以解决.)

引用: http://stackoverflow.com/questions/16017896/setting-environment-variable-for-chrome-bin-does-not-work

http://stackoverflow.com/questions/18924263/how-to-fix-error-please-set-env-variable-chrome-bin-when-running-angular-js-wi

https://github.com/karma-runner/karma/blob/master/docs/config/03-browsers.md#correct-path-to-browser-binary

2, .

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