字符串截取
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三種截取方法
let str:String = "天行健赶舆，君子以自強(qiáng)不強(qiáng)；地勢坤祭饭，君子以厚德載物涌乳。" let start = str.startIndex.advancedBy(2) let stop = str.endIndex.advancedBy(-2) let strSub1 = str.substringFromIndex(start) let strSub11 = str.substringFromIndex('天行健，'.endIndex) //"天行健甜癞，"改字符僅僅為占位符，可以用任何相同長度字符串代替 let strSub2 = str.substringToIndex(stop) let strSub = str.substringWithRange(start..<stop)
