摘要: //字符串的定义 var string = "Hello,swift"; let string1 = "hello,swift"; let string3 = ""; let string4 = string; print(string); print(string.uppercased());// 阅读全文
posted @ 2017-10-16 18:12 朝阳向日葵 阅读(4118) 评论(0) 推荐(0) 编辑