HarmonyOS NEXT数据类型和类
数据类型```布尔类型let isDone: boolean = false;数字类型let decLiteral: number = 2023; 十进制let binaryLiteral: number = 0b1111110
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数据类型```布尔类型let isDone: boolean = false;数字类型let decLiteral: number = 2023; 十进制let binaryLiteral: number = 0b1111110