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WeChat cash red envelope interface implements sample code sharing for red envelope issuance
WeChat cash red envelope interface implements sample code sharing for red envelope issuance
WeChat cash red envelope interface implements red envelope issuance:
1: Process: [
Process: WeChat users access the red envelope activity page--"The backend determines whether it is accessed by WeChat
[No: Prompt to use WeChat to open the connection, Yes: Prompt the user whether to authorize permission, obtain their user information [openID and other information]]--》
Enter the red envelope activity page--- 》The user clicks to receive the red envelope [Judge whether the red envelope has been received] Yes: [Prompt that the red envelope has been received] No
--》The back-end program calls the interface to issue the red envelope
--》WeChat user in Receive a red envelope in WeChat
--》Open the red envelope
--》The amount of the red envelope will be added to the wallet change
--》Complete the distribution of the red envelope.
】
2: To implement the WeChat cash red envelope interface to issue red envelopes, the following conditions must first be met:
1. The WeChat public account used to issue red envelopes must be of service type
2. After logging in to the official website of the WeChat official platform, on the public platform backend management page - Developer Center page,
click the "Modify Configuration" button and fill in the server address (URL), Token and EncodingAESKey ,
where URL is the interface URL used by developers to receive WeChat messages and events. Token can be filled in arbitrarily by the developer, and
is used to generate a signature (the Token will be compared with the Token contained in the interface URL to verify security).
EncodingAESKey is manually filled in by the developer or randomly generated, and will be used as the message body encryption and decryption key.
3. Obtain access_token: Official accounts can use AppID and AppSecret to call this interface to obtain access_token.
[AppID and AppSecret can be obtained from the official website of WeChat public platform - Developer Center page (you need to have become a developer, and the account has no abnormal status). 】
4. The WeChat public account must open a "webpage authorization interface" for users to obtain basic user information [especially openID, which is used when sending red envelopes]
5. The "WeChat payment" of the WeChat public account "Merchant number" in " To activate WeChat payment [the amount of red envelopes will be deducted from the payment account], open the "cash red envelope" interface [call this interface to issue red envelopes].
6. Log in to “Merchant Account” [the merchant account assigned by WeChat official account. There are instructions in Chapter 5] In "API Security", download the PHP version of the certificate [.pem format]
If the above description is not clear, please check the WeChat Developer Documentation which has detailed flash sales.
Part of the code is as follows [please see the attachment for the rest]:
<?php
namespace RedClient\Controller;
use Think\Controller;
use RedClient\Redpack\WeiXinInfo;
use RedClient\Redpack\Oauth;
use RedClient\Redpack\SendRedPack;
use RedClient\Redpack\CreateRedPack;
class IndexController extends Controller
{
public function index()
{
$this->isWeixin();//是否是微信打开
if($this->access)
{
$this->display();
}
else
{
$class=new Oauth();
$class->index('http://www.myweb.com/index.php/Index/oauth');
}
}
//获取用户信息 openID
public function oauth()
{
$code=isset($_GET['code'])?strip_tags(trim($_GET['code'])):'';
$state=isset($_GET['state'])?strip_tags(trim($_GET['state'])):'';
$class=new Oauth();
$userInfo=$class->getCode($code,$state);//获取用户信息
if(!empty($userInfo['data']))
{
//$model=M('wxuser');
//$result=$model->where('openid = "'.$userInfo['data']->openid.'"')->field('openid')->select();
if(empty($result))
{
$userInfo['data']=$this->object2array($userInfo['data']);
$model->data($userInfo['data'])->add();
}
}
$userInfo['data']=$this->object2array($userInfo['data']);
//创建红包
$class=new CreateRedPack();
$red=$class->redval();
//发红包
$class=new SendRedPack();
$configs=array(
'send_name'=>'红包发送者名称',//红包发送者名称
're_openid'=>$userInfo['data']['openid'],//接受红包的用户,用户在wxappid下的openid
'total_amount'=>$red,//付款金额，单位分
'total_num'=>'1',//红包发放总人数
'wishing'=>'红包祝福语',//红包祝福语
'client_ip'=>$_SERVER['SERVER_ADDR'],//调用接口的机器Ip地址
'act_name'=>'活动名称',//活动名称
'remark'=>'备注信息',// 备注信息
);
$class->setFields($configs);
$result=$class->requestXml();
//微信返回信息处理
if(strtoupper($result['return_code'])=='SUCCESS')
{
if(strtoupper($result['result_code'])=='SUCCESS')
{
//红包发送成功!
$datas['flag']=1;
echo $result['err_code_des'];
}
else
{
//红包发送失败
$datas['flag']=0;
$datas['msg']=$result['err_code_des'];
echo $result['err_code_des'];
}
}
else
{
//红包发送失败
$datas['flag']=0;
$datas['msg']=$result['err_code_des'];
echo $result['err_code_des'];
}
}
public function isWeixin()
{
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false)
{
$this->access=true;
}
return false;
}
//类转换成数组
public function object2array($object)
{
if (is_object($object))
{
foreach ($object as $key => $value)
{
$array[$key] = $value;
}
}
else
{
$array = $object;
}
return $array;
}
}
?><?php
namespace RedClient\Redpack;
/**
简单红包算法类
**/
class CreateRedPack
{
private $rid=0;//当前红包随机数
private $rand_arr=array();//35%是1.0到1.1 红包随机数
private $rand_arr1=array();//35%是1.1到1.2 红包随机数
private $rand_arr2=array();//30%是1.2到1.95 红包随机数
private $red=0;//红包金额
private $simplered=0;
private $red_config=array(
array('min'=>1.0,'max'=>1.1),
array('min'=>1.1,'max'=>1.2),
array('min'=>1.2,'max'=>1.95)
);
public function __construct()
{
$this->rid=mt_rand(1,10000);//当前红包随机数
$this->rand_arr=range(1,3500);//35%是1.0到1.1
$this->rand_arr1=range(3501,7000);//35%是1.1到1.2
$this->rand_arr2=range(7001,10000);//30%是1.2到1.95
$this->simplered=666;
}
public function redval()
{
$maxrp=$this->maxred();//随机最大红包金额
if($maxrp!=$this->simplered)
{
if(in_array($this->rid,$this->rand_arr))
{
$red_val=$this->red_config[0];
$min=$red_val['min']*100;
$max=$red_val['max']*100;
$this->red=mt_rand($min,$max);
$this->red=$this->red/100;
}
elseif(in_array($this->rid,$this->rand_arr1))
{
$red_val=$this->red_config[1];
$min=$red_val['min']*100;
$max=$red_val['max']*100;
$red=mt_rand($min,$max);
$this->red=$this->red/100;
}
elseif(in_array($this->rid,$this->rand_arr2))
{
$red_val=$this->red_config[2];
$min=$red_val['min']*100;
$max=$red_val['max']*100;
$this->red=mt_rand($min,$max);
$this->red=$this->red/100;
}
}
else
{
$this->red=$maxrp;
}
return $this->red?$this->red:1;
}
protected function maxred()
{
$rid=mt_rand(1,100000);
$rid1=mt_rand(1,100000);
$red=0;
$dff=$rid-$rid1;
if($dff > 0)
{
if(($rid1%$rid1)==$this->simplered)
{
$red=$this->simplered;
}
}
else
{
if(($rid1%$rid)==$this->simplered)
{
$red=$this->simplered;
}
}
return $red;
}
}
?><?php
namespace RedClient\Redpack;
/*********
先在公共平台配置授权的域名；
然后才能通过，
网页授权方式获取微信用户基本信息
网页授权流程分为四步：
1.引导用户进入授权页面同意授权，获取code
2.通过code换取网页授权access_token（与基础支持中的access_token不同）
3.如果需要，开发者可以刷新网页授权access_token，避免过期
4.通过网页授权access_token和openid获取用户基本信息
**********/
class Oauth
{
protected $appid='';
protected $redirect_uri='';
protected $state='';//mt_rand(100,999);
protected $appsecret='';
protected $data=array('flag'=>0,'msg'=>'','data'=>'');
public function __construct()
{
$this->appid='appid';//
$this->appsecret='secret';//;
$this->state=mt_rand(100,999);
}
//引导用户访问链接处理函数
public function index($redirect_uri)
{
$this->redirect_uri=urlencode($redirect_uri);//微信自动跳转到$redirect_uri
header('location:https://open.weixin.qq.com/connect/oauth2/authorize?appid='.$this->appid.'&redirect_uri='.$this->redirect_uri.'/oauth.php&response_type=code&scope=snsapi_userinfo&state='.$this->state.'&connect_redirect=1#wechat_redirect');
}
public function getCode($code='',$state='',$token='',$webToken='')
{
$data=array(
'errorno'=>'',
'errormsg'=>'',
'data'=>''
);
if(empty($code))
{
$this->data['flag']=0;
$this->data['msg']='授权失败！';
}
else
{ /*
1获取webtoken
2获取reflash_token
3获取用户信息
*/
$token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$this->appid.'&secret='.$this->appsecret.'&code='.$code.'&grant_type=authorization_code';
$token = json_decode(file_get_contents($token_url));
if (isset($token->errcode))
{
$data['errorno']=$token->errcode;
$data['errormsg']=$token->errmsg;
}
else
{
$access_token_url = 'https://api.weixin.qq.com/sns/oauth2/refresh_token?appid='.$this->appid.'&grant_type=refresh_token&refresh_token='.$token->refresh_token;
//转成对象
$accessToken = json_decode(file_get_contents($access_token_url));
if (isset($accessToken->errcode))
{
$data['errorno']=$token->errcode;
$data['errormsg']=$token->errmsg;
}
else
{
$user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$accessToken->access_token.'&openid='.$accessToken->openid.'&lang=zh_CN';
//转成对象
$userInfo = json_decode(file_get_contents($user_info_url));
if (isset($userInfo->errcode))
{
$data['errorno']=$token->errcode;
$data['errormsg']=$token->errmsg;
}
else
{
$data['data']=$userInfo;
}
}
}
}
return $data;
}
}
?><?php
/******
用于企业向微信用户个人发现金红包
目前支持向指定微信用户的openid发放指定金额红包。
（获取openid参见微信公众平台开发者文档：
网页授权获取用户基本信息）
****/
namespace RedClient\Redpack;
class SendRedPack
{
private $config=array(
'nonce_str'=>'',//随机字符串，不长于32位
'sign'=>'',//签名
'mch_billno'=>'',//商户订单号
'mch_id'=>'1111sdfsafsaddf',//微信支付分配的商户号
'wxappid'=>'sddafdsadfdsafdsdd',//微信分配的公众账号ID
'send_name'=>'',//红包发送者名称
're_openid'=>'',//接受红包的用户,用户在wxappid下的openid
'total_amount'=>'',//付款金额，单位分
'total_num'=>'',//红包发放总人数
'wishing'=>'',//红包祝福语
'client_ip'=>'',//调用接口的机器Ip地址
'act_name'=>'',//活动名称
'remark'=>'',// 备注信息
);
protected $key='';
protected $url='https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack';
protected $requestXml='';
//设置必要参数
public function setFields($conf=array())
{
foreach($conf as $k=>$v)
{
if(isset($this->config[$k]) && !empty($v))
{
$this->config[$k]=$v;
}
}
$this->config['mch_billno']=$this->billno();
$this->config['nonce_str']=$this->createNonceStr();
$this->createSign($conf);
$this->createXml();
//echo $this->requestXml;
}
protected function billno()
{
return $this->config['mch_id'].time().md5(mt_rand(1000,9999));
}
/* //检查必要参数是否为空！
public function checkConfig()
{
$flag=true;
foreach($this->config as $k=>$v)
{
if(empty($v))
{
$flag=false;
break;
}
}
} */
//随机字符串，不长于32位
public function createNonceStr( $len=32 )
{
$strs = "abcdefghijklmnopqrstuvwxyz0123456789";
$str ="";
$len=$len<=32?$len:32;
for ( $i = 0; $i < $len; $i++ )
{
$str.= substr($strs, mt_rand(0, strlen($strs)-1), 1);
}
return $str;
}
//格式化参数
public function formatParam($config=array(),$flag=1)
{
$format='';
if(!empty($config))
{
ksort($config);
foreach($config as $k=>$v)
{
if($flag)
{
$v=urlencode($v);
}
if($flag==0 && strtolower($k)=='sign')
{
continue;
}
$format.=$k.'='.$v.'&';
}
$format=trim($format,'&');
}
return $format;
}
//创建SIGNATURE
protected function createSign($config)
{
$format=$this->formatParam($config,0);
$format.='&key='.$this->key;
$signature=strtoupper(md5($format));
$this->config['sign']=$signature;
return true;//$signature;
}
//创建xml格式数据
protected function createXml()
{
$xml='<xml>';
foreach($this->config as $k=>$v)
{
if(!empty($v))
{
$xml.='<'.$k.'><![CDATA['.$v.']]></'.$k.'>';
}
}
$xml.='</xml>';
$this->requestXml=$xml;
}
//XML格式数据转换为数组
public function createArray($xml='')
{
$arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
return $arr;
}
//发送红包
public function requestXml($timeout=30,$header=array())
{
$ch = curl_init();
//超时时间
curl_setopt($ch,CURLOPT_TIMEOUT,$timeout);
curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch,CURLOPT_URL,$this->url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
//默认格式为PEM，可以注释
curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLCERT,dirname(__FILE__).'/apiclient_cert.pem');//pem证书地址
//默认格式为PEM，可以注释
curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLKEY,dirname(__FILE__).'/apiclient_key.pem');//key证书地址
curl_setopt($ch,CURLOPT_CAINFO,'PEM');
curl_setopt($ch,CURLOPT_CAINFO,dirname(__FILE__).'/rootca.pem');//CA证书地址
//两个文件合成一个.pem文件
//curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
if( count($header) >= 1 )
{
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
}
curl_setopt($ch,CURLOPT_POST, 1);
curl_setopt($ch,CURLOPT_POSTFIELDS,$this->requestXml);
$data = curl_exec($ch);
var_dump($data);
if($data)
{
curl_close($ch);
var_dump($data);
return $data;
}
else
{
$error = curl_errno($ch);
echo 'ERROR:'.$error;
curl_close($ch);
return false;
}
}
//返回非空值，非NULL
public function notEmpty($val='')
{
$return='';
if(null !=$val && strlen($val) != 0)
{
$return=$val;
}
return $return?$return:false;
}
}
?><?php
namespace RedClient\Redpack;
class WeiXinInfo
{
private $AppID='appid';
private $AppSecret='secret';
private $grant_type='client_credential';
private $url='https://api.weixin.qq.com/cgi-bin/token';
public function __construct()
{
//$arr=array('access_token'=>'1','expires'=>'7200');
}
//设置获取ACCESSTOKEN 的URL
public function setUrl()
{
return $this->url=$this->url.'?grant_type='.$this->grant_type.'&appid='.$this->AppID.'&secret='.$this->AppSecret;
}
//获取APPID,SECRET
public function getAppid()
{
$sql='select appid,secret from ly_appid where flag=1';
$model=M();
$result=$model->query($sql);
if(!empty($result))
{
$this->AppID=$result[0]['appid'];
$this->AppSecret=$result[0]['secret'];
return $result[0];
}
}
public function object2array($object)
{
if (is_object($object))
{
foreach ($object as $key => $value)
{
$array[$key] = $value;
}
}
else
{
$array = $object;
}
return $array;
}
//检验URL有效
public function checkUrl()
{
$signature=isset($_GET['signature'])?strip_tags(trim($_GET['signature'])):'';
$timestamp=isset($_GET['timestamp'])?strip_tags(trim($_GET['timestamp'])):'';
$nonce=isset($_GET['nonce'])?strip_tags(trim($_GET['nonce'])):'';
$echostr=isset($_GET['echostr'])?$_GET['echostr']:'';
if(!empty($signature) && !empty($timestamp) && !empty($nonce))
{
if($this->checkSign($signature,$timestamp,$nonce))
{
echo $echostr;
return true;
}
else
{
return false;
}
}
}
//验证SIGNATURE是否有效
private function checkSign($sign,$timestamp,$nonce)
{
$token=$this->getAccessToken();
//$token=$this->object2array($token);
$sign_arr=array($token,$timstamp,$nonce);
sort($sign_arr,SORT_STRING);
$signStr=implode($sign_arr);
$signStr=sha1($signStr);
if(strtoupper($signStr)==strtoupper($sign))
{
return true;
}
return false;
}
//通过微信接口获取微信Access_Token
public function getAccessToken()
{
$token='';
$this->setUrl();
$check=$this->checkToken();
if(session('?'.md5('getaccesstoken')) && $check)
{
$tokens=session(md5('getaccesstoken'));
$token=$tokens->access_token;
}
else
{
$result=file_get_contents($this->url);
$result=json_decode($result);
$token=$result->access_token;
$result->expires_in=$result->expires_in+time();
session(md5('getaccesstoken'),$result);
}
return $token;
}
//检查微信ACCESS_TOKEN是否有效
public function checkToken()
{
if(session('?'.md5('getaccesstoken')) && session(md5('getaccesstoken')))
{
$time=time();
$token=session(md5('getaccesstoken'));
if($token->expires_in-$time > 30)
{
return true;
}
else
{
session(md5('getaccesstoken'),null);
}
}
return false;
}
//保存微信ACCESSTOKEN到数据库
public function saveAccessToken()
{
$token=$this->getAccessToken();
$sql='select `id`,`rate`,token,ex_time,createtime from ly_token where token="'.$token.'" where appid="'.$this->AppID.'" AND secret="'.$this->AppSecret.'"';
$model=M();
$result=$model->query($sql);
if(!empty($result))
{
$time=time();
$expires=$time-$result[0]['createtime'];
if($result[0]['ex_time']-$expires > 0)
{
return $result[0]['token'];
}
else
{
$token=$this->getAccessToken();
if(!empty($token))
{
$token=json_decode($token);
if(!isset($token['errcode']) or !$token['errcode'])
{
if(isset($token['access_token']) && $token['access_token'])
{
$data['access_token']=$token['access_token'];
$data['createtime']=$time;
$data['ex_time']=$token['expires_in'];
$data['rate']=$result[0]['rate']+1;
//$sql='update ly_token set token="'.$token['access_token'].'" ,createtime='.$time.',ex_time='.$token['expires_in'].' where `id`='.$result[0]['id'];
$model=M('token');
$update=$model->where('`id`='.$result[0]['id'])->save($data);
if($update)
{
return $token['access_token'];
}
}
}
else
{//微信返回的错误信息
$data['errcode']=$token['errcode'];
$data['errmsg']=$token['errmsg'];
$data['appid']=$this->AppID;
$data['secret']=$this->AppSecret;
$data['createtime']=time();
$data['rate']=$result[0]['rate']+1;
$ein=$model->where('`id`='.$result[0]['id'])->save($data);
if($ein)
{
return false;
}
}
}
}
}
else
{//新插入数据库保存
$token=$this->getAccessToken();
$model=M('token');
if(!empty($token))
{
$data=array();
$token=json_decode($token);
if(!isset($token['errcode']) or !$token['errcode'])
{
if(isset($token['access_token']) && $token['access_token'])
{
$data['access_token']=$token['access_token'];
$data['createtime']=$time;
$data['ex_time']=$token['expires_in'];
//$sql='insert into ly_token() vlaues()';
$data['rate']=1;
$in=$model->data($data)->add();
if($ein)
{
$token['access_token'];
}
}
}
else
{//微信返回的错误信息
$data['errcode']=$token['errcode'];
$data['errmsg']=$token['errmsg'];
$data['appid']=$this->AppID;
$data['secret']=$this->AppSecret;
$data['createtime']=time();
$data['rate']=1;
$ein=$model->data($data)->add();
if($ein)
{
return false;
}
}
}
}
return false;
}
}
?>The above is the detailed content of WeChat cash red envelope interface implements sample code sharing for red envelope issuance. For more information, please follow other related articles on the PHP Chinese website!
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DeepSeek: A powerful AI image generation tool! DeepSeek itself is not an image generation tool, but its powerful core technology provides underlying support for many AI painting tools. Want to know how to use DeepSeek to generate images indirectly? Please continue reading! Generate images with DeepSeek-based AI tools: The following steps will guide you to use these tools: Launch the AI Painting Tool: Search and open a DeepSeek-based AI Painting Tool (for example, search "Simple AI"). Select the drawing mode: select "AI Drawing" or similar function, and select the image type according to your needs, such as "Anime Avatar", "Landscape"
gateio Chinese official website gate.io trading platform website
Feb 21, 2025 pm 03:06 PM
Gate.io, a leading cryptocurrency trading platform founded in 2013, provides Chinese users with a complete official Chinese website. The website provides a wide range of services, including spot trading, futures trading and lending, and provides special features such as Chinese interface, rich resources and community support.
List of handling fees for okx trading platform
Feb 15, 2025 pm 03:09 PM
The OKX trading platform offers a variety of rates, including transaction fees, withdrawal fees and financing fees. For spot transactions, transaction fees vary according to transaction volume and VIP level, and adopt the "market maker model", that is, the market charges a lower handling fee for each transaction. In addition, OKX also offers a variety of futures contracts, including currency standard contracts, USDT contracts and delivery contracts, and the fee structure of each contract is also different.
gateio exchange app old version gateio exchange app old version download channel
Mar 04, 2025 pm 11:36 PM
Gateio Exchange app download channels for old versions, covering official, third-party application markets, forum communities and other channels. It also provides download precautions to help you easily obtain old versions and solve the problems of discomfort in using new versions or device compatibility.
Ouyi Exchange app domestic download tutorial
Mar 21, 2025 pm 05:42 PM
This article provides a detailed guide to safe download of Ouyi OKX App in China. Due to restrictions on domestic app stores, users are advised to download the App through the official website of Ouyi OKX, or use the QR code provided by the official website to scan and download. During the download process, be sure to verify the official website address, check the application permissions, perform a security scan after installation, and enable two-factor verification. During use, please abide by local laws and regulations, use a safe network environment, protect account security, be vigilant against fraud, and invest rationally. This article is for reference only and does not constitute investment advice. Digital asset transactions are at your own risk.
Sesame Open Door Login Registration Entrance gate.io Exchange Registration Official Website Entrance
Mar 04, 2025 pm 04:51 PM
Gate.io (Sesame Open Door) is the world's leading cryptocurrency trading platform. This article provides a complete tutorial on spot trading of Gate.io. The tutorial covers steps such as account registration and login, KYC certification, fiat currency and digital currency recharge, trading pair selection, limit/market transaction orders, and orders and transaction records viewing, helping you quickly get started on the Gate.io platform for cryptocurrency trading. Whether a beginner or a veteran, you can benefit from this tutorial and easily master the Gate.io trading skills.
How to copy Xiaohongshu copywriting. Graphical tutorial on how to copy Xiaohongshu copywriting.
Jan 16, 2025 pm 04:03 PM
Learn to easily copy Xiaohongshu copywriting! This tutorial teaches you step by step how to quickly copy Xiaohongshu video copy, saying goodbye to tedious steps. Open the Xiaohongshu APP, find the video you like, and click on the [Copywriting] area below the video. Long press the copy text and select the [Extract Text] function from the pop-up options. The system will automatically extract the text, click the [Copy] button in the lower left corner. Open WeChat or other applications, such as Moments, long press the input box, and select [Paste]. Click Send to complete the copy. It's that simple!
The difference between H5 and mini-programs and APPs
Apr 06, 2025 am 10:42 AM
H5. The main difference between mini programs and APP is: technical architecture: H5 is based on web technology, and mini programs and APP are independent applications. Experience and functions: H5 is light and easy to use, with limited functions; mini programs are lightweight and have good interactiveness; APPs are powerful and have smooth experience. Compatibility: H5 is cross-platform compatible, applets and APPs are restricted by the platform. Development cost: H5 has low development cost, medium mini programs, and highest APP. Applicable scenarios: H5 is suitable for information display, applets are suitable for lightweight applications, and APPs are suitable for complex functions.
