1、字符串 // 1.String的遍历var str = "Hello, playground" for s in str.character...
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1、字符串 // 1.String的遍历var str = "Hello, playground" for s in str.character...
1.常量和变量 /********** 1.常量和变量的基本使用 **********/var age : Int = 20age = 25 l...
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