public function downCardList($product_id){        $product = model('Product')->getOneData(' * ',['id'=>$product_id]);        $card = model('CardType')->getOneData(' * ',['id'=>$product['cardtype']]);        $table = 'card_'.$card->mark;        $data = Db::table($table)->field('*')->where(['product_id'=>$product_id])->select();        //到这里都是获取信息        //开始设置内容        $str  = ' < html>';        $str .= ' < head>';        $str .= ' < meta http - equiv = "Content-Type" content = "text/html; charset=utf-8" > ';        $str .= ' ';        $str .= ' ';        $str .= '
    
      ';        $str .= '
        ';        $str .= "
 ";        $str .= '
 ';        $str .= '
        ';        $str .= "
 ";        $str .= '
 ';        $str .= '
        ';        $str .= "
 ";        $str .= '
 ';        $str .= '
        ';        $str .= '
';        $str .= '
 ';        //遍历主体内容        foreach ($data as $val){            $str .= '
        ';            //数字每四位加空格，方便看            $psw = substr_replace($val['password'],' ',4,0);            $psw = substr_replace($psw,' ',9,0);            $psw = substr_replace($psw,' ',14,0);            $str .= "
 ";//vnd.ms-excel.numberformat:@将表格设置为文本，以便长数字全部正常显示            $str .= '
 ';        }        $str .= '
     
      
       
 产品名称
        
 ".$product->name."
      
      
       
 产品数量
        
 ".$product->num."
      
      
       
 产品创建时间
        
 ".$product->create_time."
      
      
       
 卡号
        
 激活码
      
      
       
".$card->mark.$val['id']."
        
".$psw."
      
     
    
 ';        $str .= ' ';        $str .= ' ';        header("cache-control:no-cache,must-revalidate");//无浏览器缓存        header("Content-Type:application/vnd.ms-execl");//提示下载为Excel        header("Content-Type:application/octet-stream");        header("Content-Type: application/force-download");        header("Content-Disposition: attachment; filename=".$product->name.'-'.date('Y-m-d').".xls");        header('Expires:0');        header('Pragma:public');        echo "\xFF\xFE".mb_convert_encoding( $str, 'UCS-2LE', 'UTF-8' );    }