//字符串的替换

        let  ReplaceString = "http://www.aimonkey。cn"

        let FilterReplace = ReplaceString.replacingOccurrences(of: "。", with: ".")

        print(FilterReplace)

        //字符串的删除

        let str = ReplaceString.replacingOccurrences(of: "w", with: "")

        print(str)

        //字符串的截取

        //将ReplaceString 转换为OC 的字符串使用,根据范围来截取字符串

        let subString1 = (ReplaceString as NSString).substring(with: NSMakeRange(1, 3))

        print(subString1)

        //截取下标2 之前的字符

        let subString2 = (ReplaceString as NSString).substring(to: 2)

        print(subString2)

        //截取下标2 之后(含有2)

        let subString3 = (ReplaceString as NSString).substring(from: 2)

        print(subString3)

        //字符串的分割

        let url  = "http://blog.csdn.net/hello_hwc?viewmode=list"

        let urled = url.components(separatedBy: "/")

        print(urled)

       //字符串的拼接

                  let str = "Hello"
                  let newStr = str + "work"
                  print(newStr)        //Hellowork

                let str = String(format: "称呼 ： %@", dic["firstName"]! as! CVarArg)