+ （NSString *）formatNumber：（NSString *）string
{
NSString *result = @"--";
if（string && string.length > 0 && ![string isEqualToString:result]）{
if ([string floatValue] < 1000000) {
result = [NSString stringWithFormat:@"%.2f",[string floatValue]];
}else {
result = [NSString stringWithFormat:@"%d",[string intValue]];
}
}
return result;
}