xcode 下载地址 （复制粘贴到迅雷里面就可以了，最好买个几小时的迅雷会员这样快些）

https://adcdownload.apple.com/Developer_Tools/Hardware_IO_Tools_for_Xcode_7.1/Hardware_IO_Tools_for_Xcode_7.1.dmg     https://adcdownload.apple.com/Developer_Tools/H