<script type="text/javascript">
    function getPdfVersion() {
 
        try {
 
            var pdf = document.createElement('object');
 
            pdf.classid = 'clsid:CA8A9780-280D-11CF-A24D-444553540000';
 
            return pdf.GetVersions().match(/Accessibility\s*=\s*(.*?)([\s,$])/)[1];
        }
 
        catch (e) {
 
            return null;  // 返回null表示未安装
 
        }
    }
 
    alert(getPdfVersion());
 
</script>