微信公众号跳转小程序，详细教程

晚9点开始，11点结束，踩坑2个小时精华总结

废话不多说，直接上代码

前端

<style>
.launch_btn_2 {
  position:fixed;
  top:200px;
  right:-50px;
  width:145px;
  height:45px;
  z-index:999;
  borde-radius:25px;
  background:transparent;
  display:block;
}
</style>

<div class="launch_btn_2">
  <wx-open-launch-weapp id="launch-btn" username="gh_xxxxx" path="/pages/home/index.html"
  style="display: block;">
    <template>
      <style>
        .btn {width: 80px; height: 30px;border-radius: 25px;background:#085B27;display:block;border:0px;color:white;}
      </style>
      <div style="text-align: center;align-items: center;margin: 10px;">
        <button class="btn btn-open-weapp">
          进入小程序
        </button>
      </div>
    </template>
  </wx-open-launch-weapp>
  <script>
    var btn = document.getElementById('launch-btn');
    btn.addEventListener('launch',
    function(e) {
      console.log('success');
    });
    btn.addEventListener('error',
    function(e) {
      console.log('fail', e.detail);
    });
  </script>
</div>
// 最后
<script src="https://res.wx.qq.com/open/js/jweixin-1.6.0.js">
</script>
<script type="text/javascript">
  wx.config({
    debug: false,
    // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
    appId: 'xxxxxxx', // 必填，公众号的唯一标识
    timestamp: '<!--{$timestamp}-->', // 必填，生成签名的时间戳
    nonceStr: '<!--{$nonceStr}-->', // 必填，生成签名的随机串
    signature: '<!--{$sha_str}-->', // 必填，签名
    jsApiList: ['onMenuShareTimeline', 'scanQRCode', 'openLocation'], // 必填，需要使用的JS接口列表,
    openTagList: ['wx-open-launch-weapp']
  });
  wx.ready(function() {
    console.log('接口配置成功');
  });
</script>

php服务端

//add

// 微信 JS 接口签名校验工具: https://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
$appid = xxxxx'; //填入服务号AppID
$secret = 'xxxxxxxx'; //填入服务号AppSecret

// 获取token
$token_data = file_get_contents('./wechat_token.txt');
if (!empty($token_data)) {
  $token_data = json_decode($token_data, true);
}
$time = time() - $token_data['time'];
if ($time > 3600) {
  $token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$appid}&secret={$secret}";
  $token_res = https_request($token_url);
  $token_res = json_decode($token_res, true);
  $token = $token_res['access_token'];
  $data = array('time' = >time(), 'token' = >$token);
  $res = file_put_contents('./wechat_token.txt', json_encode($data));
  if ($res) {
    //        echo '更新 token 成功';
  }
} else {
  $token = $token_data['token'];
}

// 获取ticket
$ticket_data = file_get_contents('./wechat_ticket.txt');
if (!empty($ticket_data)) {
  $ticket_data = json_decode($ticket_data, true);
}
$time = time() - $ticket_data['time'];
if ($time > 3600) {
  $ticket_url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token={$token}&type=jsapi";
  $ticket_res = https_request($ticket_url);
  $ticket_res = json_decode($ticket_res, true);
  $ticket = $ticket_res['ticket'];
  $data = array('time' = >time(), 'ticket' = >$ticket);
  $res = file_put_contents('./wechat_ticket.txt', json_encode($data));
  if ($res) {
    //        echo '更新 ticket 成功';
  }
} else {
  $ticket = $ticket_data['ticket'];
}

// 进行sha1签名
$timestamp = time();
$nonceStr = createNonceStr();

// 注意 URL 建议动态获取(也可以写死).
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://": "http://";
$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"; // 调用JSSDK的页面地址
// $url = $_SERVER['HTTP_REFERER']; // 前后端分离的, 获取请求地址(此值不准确时可以通过其他方式解决)
$str = "jsapi_ticket={$ticket}&noncestr={$nonceStr}&timestamp={$timestamp}&url={$url}";
$sha_str = sha1($str);

function createNonceStr($length = 16) {
  $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  $str = "";
  for ($i = 0; $i < $length; $i++) {
    $str. = substr($chars, mt_rand(0, strlen($chars) - 1), 1);
  }
  return $str;
}

/**
 * 模拟 http 请求
 * @param  String $url 请求网址
 * @param  Array $data 数据
 */
function https_request($url, $data = null) {
  // curl 初始化
  $curl = curl_init();
  // curl 设置
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
  // 判断 $data get  or post
  if (!empty($data)) {
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
  }
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  // 执行
  $res = curl_exec($curl);
  curl_close($curl);
  return $res;
}
//end

ps： 1.wx-open-launch-weapp标签 username填写的是小程序源氏ID 2.给button标签添加 display:block;属性 3.微信开发者工具无法调试，按钮不会显示，只能在微信内打开测试（按钮只会在手机微信内访问H5显示）。 4.openTagList: [‘wx-open-launch-weapp’] 5.js接口列表填写openLocation。 6.欢迎各位大大补充~~ 如果对你有帮助，小手一扫，给孩子口饭吃吧~~