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 .= '</head > ';
$str .= '<body > ';
$str .= '<table width = "16rem" border = "1" align = "center" cellspacing = "1" cellpadding = "1" > ';
$str .= '<tr align = "center" > ';
$str .= "<td nowrap ><b > 产品名称</b ></td > <td nowrap ><b > ".$product->name."</b ></td > ";
$str .= '</tr > ';
$str .= '<tr align = "center" > ';
$str .= "<td nowrap ><b > 产品数量</b ></td > <td nowrap ><b > ".$product->num."</b ></td > ";
$str .= '</tr > ';
$str .= '<tr align = "center" > ';
$str .= "<td nowrap ><b > 产品建立时间</b ></td > <td nowrap ><b > ".$product->create_time."</b ></td > ";
$str .= '</tr > ';
$str .= '<tr align = "center" > ';
$str .= '<td nowrap ><b > 卡号</b ></td > <td nowrap ><b > 激活码</b ></td >';
$str .= '</tr > ';
//遍历主体内容
foreach ($data as $val){
$str .= '<tr align = "center" > ';
//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);
$str .= "<td nowrap >".$card->mark.$val['id']."</td > <td nowrap style='vnd.ms-excel.numberformat:@'>".$psw."</td > ";//vnd.ms-excel.numberformat:@将表格设置为文本，以便长数字所有正常显示
$str .= '</tr > ';
}
$str .= '</table > ';
$str .= '</body > ';
$str .= '</html > ';
header("cache-control:no-cache,must-revalidate");//无浏览器缓存
header("Content-Type:application/vnd.ms-execl");//提示下载为Excel
header("Content-Type:application/octet-stream");
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=".$product->name.'-'.date('Y-m-d').".xls");
header('Expires:0');
header('Pragma:public');
echo "\xFF\xFE".mb_convert_encoding( $str, 'UCS-2LE', 'UTF-8' );
}