问题：

[!] CDN: trunk Repo update failed - 61 error(s):
CDN: trunk URL couldn’t be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/b/0/d/JPush/1.6.0/JPush.podspec.json Response: Timeout was reached

解决方法：

1、下载CocoaPods/Specs
2、将下载到的cocoapods文件中的Specs拷贝到cd ~/.cocoapods/repos/trunk中
3、pod install解决。