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HTML：

<a href="#" onClick="return fbs_click(600, 400,'MyURL?image_name=<?php echo $row['image_name'] ?>&caption=<?php echo $row['caption']?>')" target="_blank" title="I just visited the Baidu Moustache Studio!"><img src="/assets/fbshare.png" alt="facebook share" height="22"></a>

Javascript：

 function fbs_click(width, height,url) {

    u=location.href;
    t= "Title";
    /*Url to update metadata */
    var updatemetadate = "https://graph.facebook.com/?id="+encodeURIComponent(url)+"&scrape=true"
    if (window.XMLHttpRequest) {
                    // code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp = new XMLHttpRequest();
        } else {
                // code for IE6, IE5
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange = function() {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    console.log("meta data updated!");
                    var leftPosition, topPosition;
                    //Allow for borders.
                    leftPosition = (window.screen.width / 2) - ((width / 2) + 10);
                    //Allow for title and status bars.
                    topPosition = (window.screen.height / 2) - ((height / 2) + 50);
                    var windowFeatures = "status=no,height=" + height + ",width=" + width + ",resizable=yes,left=" + leftPosition + ",top=" + topPosition + ",screenX=" + leftPosition + ",screenY=" + topPosition + ",toolbar=no,menubar=no,scrollbars=no,location=no,directories=no";
                     window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(url)+'&t='+encodeURIComponent(t),'sharer', windowFeatures);
                     return false;

            }
        }
    xmlhttp.open("GET",updatemetadate,true);
    xmlhttp.send();


}

现在，当我单击共享时，图像在前几次尝试中不会出现，但稍后会出现。似乎元标记更新较晚。

任何指针？

谢谢，

ps 也尝试了新的 Facebook（https://developers.facebook.com/docs/sharing/web）重定向方法。结果是一样的。

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