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字符串转数组
let str = "1,2,3"
let strArray = str.componentsSeparatedByString(",")
数组转字符串
let array = ["1","2","3"]
let arrayStr = ",".join(array)
println(arrayStr) //"1,2,3"
//如果只是想打印出来可以这么用
println(array.description) //"[1, 2, 3]"