前提
- 微信自6.5.5版本起对分享网页链接做了限制，如果不接入JSSDK，则分享出去的内容不会显示自定义的图片，而是显示一张默认图片
- 使用JSSDK进行分享时，需要一个经过微信认证的服务号或者订阅号，并在公众号平台查询是否有分享接口的权限；
公众号设置
在进行代码开发前，需要到公众号平台上做一些设置：
- 到“开发 -> 基本设置“页面获取AppId和AppSecret，并设置ip白名单；
- 到“设置 -> 公众号设置“的“功能设置”tab添加JS接口安全域名；
代码（PHP）
1）jssdk.php
<?php
class JSSDK {
private $appId;
private $appSecret;
public function __construct($appId, $appSecret) {
$this->appId = $appId;
$this->appSecret = $appSecret;
}
public function getSignPackage() {
$jsapiTicket = $this->getJsApiTicket();
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://"; : "http://";;
$url = "$protocol$_SERVER[HTTP_HOST]$_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() {
$accessToken = $this->getAccessToken();
// 如果是企业号用以下 URL 获取 ticket
// $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";;
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";;
$res = json_decode($this->httpGet($url));
$ticket = $res->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
// 如果是企业号用以下URL获取access_token
// $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";;
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";;
$res = json_decode($this->httpGet($url));
$access_token = $res->access_token;
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_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_URL, $url);
$res = curl_exec($curl);
curl_close($curl);
return $res;
}
}
- weixin.php
<?php
require_once "jssdk.php";
$appid = '*************';
$appsecret = '************';
$jssdk = new JSSDK($appid, $appsecret);
$signPackage = $jssdk->GetSignPackage();
include("tpl/weixin.html”);
- weixin.html
<!DOCTYPE html>
<html>
<head>
<script src="https://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>;
</head>
<body>
<script type="text/javascript">
wx.config({
debug: true,
appId: '<?=$signPackage[appId]?>',
timestamp: '<?=$signPackage["timestamp"]?>',
nonceStr: '<?=$signPackage["nonceStr"]?>',
signature: '<?=$signPackage["signature"]?>',
jsApiList: [
// 所有要调用的 API 都要加到这个列表中
'onMenuShareTimeline',
'onMenuShareAppMessage'
]
});
//完成wx.config，执行这里
wx.ready(function () {
//分享到朋友圈
wx.onMenuShareTimeline({
title: '1111111',
link: window.location.href,
imgUrl: "a.jpg",
success: function () {
alert('success');
},
cancel: function () {
alert('cancel');
}
});
//分享给朋友
wx.onMenuShareAppMessage({
title: '22222',
desc: '22222',
link: window.location.href,
imgUrl: "a.jpg",
success: function (res) {
alert('已分享');
},
cancel: function (res) {
alert('已取消');
},
fail: function (res) {
alert(JSON.stringify(res));
}
});
});
</script>
This is a test page.
</body>
</html>
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