- 注意一定要是微信内置浏览器打开的页面，外部浏览器打开的页面不能使用这种方式跳转至小程序
配置微信公众号的 JS 接口安全域名
配置路径为公众号后台-设置与开发-公众号设置-功能设置-JS接口安全域名
获取需要跳转小程序的原始ID
获取公众号的AppID、AppSecret
这几个数值之后需要用到，先记录下来
需要跳转小程序原始ID获取路径：小程序后台-设置与开发-公众号设置-帐号详情-原始ID（需要拉到最底端）
AppID、AppSecret获取路径：公众号后台-设置与开发-基本配置-公众号开发信息（AppSecret没有设置的需要先设置）
页面开发
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>测试</title>
</head>
<body>
<div class="home">
<wx-open-launch-weapp
id="launch-btn"
username="这里填需要跳转的小程序原始ID"
>
<script type="text/wxtag-template">
<style>.btn { display: flex;align-items: center; }</style>
<button class="wx-btn">跳转小程序</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, // 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: appId, // 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: signature,// 必填，签名
jsApiList: ["onMenuShareWeibo"], // 必填，需要使用的JS接口列表
openTagList: ['wx-open-launch-weapp']
});
wx.ready(function(){
// config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。
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信息验证失败会执行error函数，如签名过期导致验证失败，具体错误信息可以打开config的debug模式查看，也可以在返回的res参数中查看，对于SPA可以在这里更新签名。
});
wx.checkJsApi({
jsApiList: [], // 需要检测的JS接口列表，所有JS接口列表见附录2,
success: function(res) {
// 以键值对的形式返回，可用的api值true，不可用为false
// 如：{"checkResult":{"chooseImage":true},"errMsg":"checkJsApi:ok"}
}
});
</script>
</html>
wx-open-launch-weapp标签的username属性填上需要跳转的小程序原始ID
php程序开发
<?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();
// 这里参数的顺序要按照 key 值 ASCII 码升序排序
$string = "jsapi_ticket=$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 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode(file_get_contents("jsapi_ticket.json"));
if ($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 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode(file_get_contents("access_token.json"));
if ($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;
}
}
//调用
$jssdk = new JSSDK("wxe80e2bcc30d63eaf", "e24d87afe97b01f4c4c355a206f9e92e");
$signPackage = $jssdk->GetSignPackage();
?>
最后返回的signPackage数据渲染到页面上
（完结）
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