NSArray *testArray = [NSArrayarrayWithObjects:@"2.0", @"2.3", @"3.0",@"4.0", nil];
NSNumber *sum = [testArrayvalueForKeyPath:@"@sum.floatValue"];
NSNumber *avg= [testArray valueForKeyPath:@"@avg.floatValue"];
NSArray *testArray = [NSArrayarrayWithObjects:@"2.0", @"2.3", @"3.0",@"4.0", nil];
NSNumber *sum = [testArrayvalueForKeyPath:@"@sum.floatValue"];
NSNumber *avg= [testArray valueForKeyPath:@"@avg.floatValue"];
+ (NSString *)flattenHTML:(NSString *)html{ //去除html格式 NSScanner *theScanner; NSString *text = nil;
+ (NSString *) setmd5:(NSString *) input{ //MD5加密 const char *cStr = [input UTF8String]; unsigned