<html> <head> <script> function isAcrobatPluginInstall() { var flag = false; // 如果是firefox浏览器 if (navigator.plugins && navigator.plugins.length) { for (x = 0; x < navigator.plugins.length; x++) { if (navigator.plugins[x].name == ‘Adobe Acrobat‘) flag = true; } } // 下面代码都是处理IE浏览器的情况 else if (window.ActiveXObject) { for (x = 2; x < 10; x++) { try { oAcro = eval_r("new ActiveXObject(‘PDF.PdfCtrl." + x + "‘);"); if (oAcro) { flag = true; } } catch (e) { flag = false; } } try { oAcro4 = new ActiveXObject(‘PDF.PdfCtrl.1‘); if (oAcro4) flag = true; } catch (e) { flag = false; } try { oAcro7 = new ActiveXObject(‘AcroPDF.PDF.1‘); if (oAcro7) flag = true; } catch (e) { flag = false; } } if (flag) { alert("yes"); return true; } else { alert("对不起,您还没有安装PDF阅读器软件呢,为了方便预览PDF文档,请选择安装！"); location = ‘http://ardownload.adobe.com/pub/adobe/reader/win/9.x/9.3/chs/AdbeRdr930_zh_CN.exe‘; } return flag; } </script> </head> <body> <input type="button" value="jiance" onclick="isAcrobatPluginInstall()"/> </body> </html>
原文：http://www.cnblogs.com/lihfeiblogs/p/4126690.html