swift字符串替换

var  str ="15037919912"

        letstartIndex = str.index(str.startIndex, offsetBy:3)

        letendIndex = str.index(str.startIndex, offsetBy:6)

        let  range = startIndex...endIndex

        //str.replaceSubrange(range, with: "Object -")

        str.replaceSubrange(range, with:"****")

        print("替换范围后的+\(str)")//150****9912

        var str1 = "410311199301095011"

        letstartIndexs = str1.index(str1.startIndex, offsetBy:6)

        letendIndexs = str1.index(str1.startIndex, offsetBy:13)

        let  ranges = startIndexs...endIndexs

        str1.replaceSubrange(ranges, with:"********")

        print("替换范围后的+\(str1)")//410311********5011