方法：

把下面的代码直接放到带有“主题页”标示的编辑框里面就可以了

<div class="card text-center">
<div class="card-header">用手机扫描二维码继续阅读</div>
<div class="card-body"><img id="qrcode" class="p-1" src=""></div>
</div>
<script type="text/javascript">
    var setting = {
        url: window.location.href,
        qrcodeApi: "https://www.kuaizhan.com/common/encode-png?large=true&data="  
    }
    document.getElementById("qrcode").src = setting.qrcodeApi + urlEncode(setting.url);
    function urlEncode(String) {
        return encodeURIComponent(String).replace(/'/g,"%27").replace(/"/g,"%22"); 
    }
</script>