@H_
404_1@var specializationTitles = ["a","b","c","d"]
let outputString = join(" / ",specializationTitles)
发生错误：
Cannot invoke join with an argument list of type (String,[String])
如何解决这个问题？
@H_
404_1@let separator = " / "
let outputString = separator.join(specializationTitles)
与Xcode7beta6：
@H_
404_1@specializationTitles.joinWithString(" / ")
使用Xcode7发布版本：
@H_
404_1@specializationTitles.joinWithSeparator(" / ")
