试了几种，都不可以：
for sectionIdx in [0…self.fileSectionList.count] { let curFileSectionItem:FileSectionItem = self.fileSectionList[sectionIdx] |
swift for in int
参考官网：
The Swift Programming Language (Swift 2.1): Control Flow
最后用：
for sectionIdx in 0…(self.fileSectionList.count–1) { let curFileSectionItem:FileSectionItem = self.fileSectionList[sectionIdx] |
即可.
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