NSString

//以””为分界将字符拆分为2个
str = @“26_1”;
NSString *bloggerID = [str componentsSeparatedByString:@""][0];//取第0个

[self loadDataList:nil success:^{
[weakSelf.tableView reloadData];
} failure:^{
[weakSelf showErrorMsg:@"网络不给力，数据请求失败."];
}];