1、二进制规律
1. 与运算(AND):a & b
当且仅当a和b的相应位都为1时,结果的相应位才为1,否则为0。2、 或运算(OR):a | b
只要a或b的相应位中至少有一个为1,结果的相…
D:\Flutter\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel stable, v1.2.1, on Microsoft Windows [Version 10.0.22631.3296], locale zh-CN)• Flutter version 1.2.1 at D:\Flutter\flutter• Framework revision 8661d8aecd (5 years ago), 2019-02-14 …