block使用细节_01

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改成如下即可：

  NSArray *arr = @[^{NSLog(@"block0 :%d",val);},
                    ^{NSLog(@"block1 :%d",val);},
                    ^{NSLog(@"block2 :%d",val);},
                    ^{NSLog(@"block3 :%d",val);}];

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