针对静态页面无法直接获取微信分享签名的问题，本文介绍通过Ajax异步请求后端PHP文件生成签名的解决方案。前端引入微信JS-SDK并调用接口，后端处理URL签名逻辑，从而实现静态HTML页面的微信分享标题、描述及缩略图功能。
静态页面微信分享背景
在微信中分享网页链接时，通常希望展示包含标题、描述及缩略图的卡片样式。虽然微信官方开发文档提供了相关示例，但这些示例主要面向动态生成的页面。当使用phpcms等工具将页面生成静态HTML文件后，原有的动态签名获取方式失效。通过搜索发现，有开发者利用Ajax技术实现了静态页面调用微信分享接口的方案，现整理分享如下。
前端代码实现
前端代码实现如下：
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script>
url=location.href;
$.ajax({
type : "get",
url : "http://xxxxxxxxx/jssdk.php?url="+url,//替换网址，xxx根据自己jssdk文件位置修改
dataType : "jsonp",
jsonp: "callback",
jsonpCallback:"success_jsonpCallback",
success : function(data){
wx.config({
appId: data.appId,
timestamp: data.timestamp,
nonceStr: data.nonceStr,
signature: data.signature,
jsApiList: [
"onMenuShareTimeline", //分享给好友
"onMenuShareAppMessage", //分享到朋友圈
"onMenuShareQQ", //分享到QQ
"onMenuShareWeibo" //分享到微博
]
});
},
error:function(data){
alert("连接失败！");
}
});
wx.ready(function (){
var shareData = {
title: '标题',
desc: '简介',//这里请特别注意是要去除html
link: '链接',
imgUrl: '题图'
};
wx.onMenuShareAppMessage(shareData);
wx.onMenuShareTimeline(shareData);
wx.onMenuShareQQ(shareData);
wx.onMenuShareWeibo(shareData);
});
</script> 注意需引入jQuery库，否则Ajax请求无法正常运行。
后端签名处理
同时需要修改服务端文件jssdk.php以配合前端调用。
<?php
$url = $_GET['url'];
class JSSDK {
private $appId;
private $appSecret;
private $url;
public function __construct($appId, $appSecret,$url) {
$this->appId = $appId;
$this->appSecret = $appSecret;
$this->url = $url;
}
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]";
$url =$this->url;
$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();
// 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 = $res->ticket;
if ($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()) {
// 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 = $res->access_token;
if ($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_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;
}
}
$jssdk = new JSSDK("公众号ID", "公众号密钥",$url);//按照自己的公众号填写
$signPackage = $jssdk->GetSignPackage();
$tmp=json_encode(array ('appId'=>$signPackage["appId"],'timestamp'=>$signPackage["timestamp"],'nonceStr'=>$signPackage["nonceStr"],'signature'=>$signPackage["signature"],'url'=>$signPackage["url"]));
$callback = $_GET['callback'];
echo $callback.'('.$tmp.')';
exit;
?> 配置说明
其余配置步骤与动态页面保持一致即可。
以上即为JS在静态页面中实现微信分享功能的完整介绍，希望能帮助到读者。如有疑问欢迎留言，小编会及时回复。感谢对本站的支持！