- 注意一定要是微信內(nèi)置瀏覽器打開的頁面，外部瀏覽器打開的頁面不能使用這種方式跳轉(zhuǎn)至小程序
配置微信公眾號的 JS 接口安全域名
配置路徑為公眾號后臺-設(shè)置與開發(fā)-公眾號設(shè)置-功能設(shè)置-JS接口安全域名
獲取需要跳轉(zhuǎn)小程序的原始ID
獲取公眾號的AppID、AppSecret
這幾個數(shù)值之后需要用到，先記錄下來
需要跳轉(zhuǎn)小程序原始ID獲取路徑：小程序后臺-設(shè)置與開發(fā)-公眾號設(shè)置-帳號詳情-原始ID（需要拉到最底端）
AppID、AppSecret獲取路徑：公眾號后臺-設(shè)置與開發(fā)-基本配置-公眾號開發(fā)信息（AppSecret沒有設(shè)置的需要先設(shè)置）
頁面開發(fā)
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>測試</title>
</head>
<body>
<div class="home">
<wx-open-launch-weapp
id="launch-btn"
username="這里填需要跳轉(zhuǎn)的小程序原始ID"
>
<script type="text/wxtag-template">
<style>.btn { display: flex;align-items: center; }</style>
<button class="wx-btn">跳轉(zhuǎn)小程序</button>
</script>
</wx-open-launch-weapp>
</div>
</body>
<script type="text/javascript" src="https://res2.wx.qq.com/open/js/jweixin-1.6.0.js"></script>
<script type="text/javascript">
var appId = "<?php echo $signPackage['appId']; ?>";
var nonceStr = "<?php echo $signPackage['nonceStr']; ?>";
var timestamp = "<?php echo $signPackage['timestamp']; ?>";
var signature = "<?php echo $signPackage['signature']; ?>";
wx.config({
debug: false, // 開啟調(diào)試模式,調(diào)用的所有api的返回值會在客戶端alert出來，若要查看傳入的參數(shù)，可以在pc端打開，參數(shù)信息會通過log打出，僅在pc端時才會打印。
appId: appId, // 必填，公眾號的唯一標(biāo)識
timestamp: timestamp, // 必填，生成簽名的時間戳
nonceStr: nonceStr, // 必填，生成簽名的隨機串
signature: signature,// 必填，簽名
jsApiList: ["onMenuShareWeibo"], // 必填，需要使用的JS接口列表
openTagList: ['wx-open-launch-weapp']
});
wx.ready(function(){
// config信息驗證后會執(zhí)行ready方法，所有接口調(diào)用都必須在config接口獲得結(jié)果之后，config是一個客戶端的異步操作，所以如果需要在頁面加載時就調(diào)用相關(guān)接口，則須把相關(guān)接口放在ready函數(shù)中調(diào)用來確保正確執(zhí)行。對于用戶觸發(fā)時才調(diào)用的接口，則可以直接調(diào)用，不需要放在ready函數(shù)中。
var btn = document.getElementById('launch-btn');
btn.addEventListener('launch', function (e) {
console.log('success');
});
btn.addEventListener('error', function (e) {
console.log('fail', e.detail);
});
});
wx.error(function(res){
// config信息驗證失敗會執(zhí)行error函數(shù)，如簽名過期導(dǎo)致驗證失敗，具體錯誤信息可以打開config的debug模式查看，也可以在返回的res參數(shù)中查看，對于SPA可以在這里更新簽名。
});
wx.checkJsApi({
jsApiList: [], // 需要檢測的JS接口列表，所有JS接口列表見附錄2,
success: function(res) {
// 以鍵值對的形式返回，可用的api值true，不可用為false
// 如：{"checkResult":{"chooseImage":true},"errMsg":"checkJsApi:ok"}
}
});
</script>
</html>
wx-open-launch-weapp標(biāo)簽的username屬性填上需要跳轉(zhuǎn)的小程序原始ID
php程序開發(fā)
<?php
class JSSDK {
private $appId;
private $appSecret;
public function __construct($appId, $appSecret) {
$this->appId = $appId;
$this->appSecret = $appSecret;
}
public function getSignPackage() {
$jsapiTicket = $this->getJsApiTicket();
$url = "https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$timestamp = time();
$nonceStr = $this->createNonceStr();
// 這里參數(shù)的順序要按照 key 值 ASCII 碼升序排序
$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$timestamp&url=$url";
$signature = sha1($string);
$signPackage = array(
"appId" => $this->appId,
"nonceStr" => $nonceStr,
"timestamp" => $timestamp,
"url" => $url,
"signature" => $signature,
"rawString" => $string
);
return $signPackage;
}
private function createNonceStr($length = 16) {
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
return $str;
}
private function getJsApiTicket() {
// jsapi_ticket 應(yīng)該全局存儲與更新，以下代碼以寫入到文件中做示例
$data = json_decode(file_get_contents("jsapi_ticket.json"));
if ($data->expire_time < time()) {
$accessToken = $this->getAccessToken();
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
$res = json_decode($this->httpGet($url));
$ticket = $res->ticket;
if ($ticket) {
$data->expire_time = time() + 7000;
$data->jsapi_ticket = $ticket;
$fp = fopen("jsapi_ticket.json", "w");
fwrite($fp, json_encode($data));
fclose($fp);
}
} else {
$ticket = $data->jsapi_ticket;
}
return $ticket;
}
private function getAccessToken() {
// access_token 應(yīng)該全局存儲與更新，以下代碼以寫入到文件中做示例
$data = json_decode(file_get_contents("access_token.json"));
if ($data->expire_time < time()) {
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
$res = json_decode($this->httpGet($url));
$access_token = $res->access_token;
if ($access_token) {
$data->expire_time = time() + 7000;
$data->access_token = $access_token;
$fp = fopen("access_token.json", "w");
fwrite($fp, json_encode($data));
fclose($fp);
}
} else {
$access_token = $data->access_token;
}
return $access_token;
}
private function httpGet($url) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 500);
curl_setopt($curl, CURLOPT_URL, $url);
$res = curl_exec($curl);
curl_close($curl);
return $res;
}
}
//調(diào)用
$jssdk = new JSSDK("wxe80e2bcc30d63eaf", "e24d87afe97b01f4c4c355a206f9e92e");
$signPackage = $jssdk->GetSignPackage();
?>
最后返回的signPackage數(shù)據(jù)渲染到頁面上
（完結(jié)）
