017_swift_截取字符串 区间

import Foundation
//闭区间
let closedRange:ClosedRange=1...3
//半开区间
let helfOpenRange:Range=1..<3
let intArray=["1","2","3","4","5"]
print(intArray[closedRange])
print(intArray[helfOpenRange])
//截取字符串
var myUlr="yzdzy.com"
let startIndex=myUlr.index(myUlr.startIndex,offsetBy: 0)
let endIndex=myUlr.index(myUlr.startIndex,offsetBy: 3)
let myRange=startIndex..<endIndex
myUlr[myRange]
// 参数1 位置 参数2  长度
let range=NSRange.init(location: 3, length: 1)
intArray[Range.init(range)!]
let myWebSite=myUlr as NSString
myWebSite.substring(with: NSRange.init(location: 0, length: 2))