javascript - 使用 JavaScript 在 ie11 中检测 Adob​​e Reader

Question

我正在尝试检测 IE11 的 Adob​​e Reader 插件，但由于某种原因它总是返回 null。我相信这是因为 IE11 没有使用与旧版本 Internet Explorer 相同的插件名称，但我不确定。

我直接从这个网站(这个网站的用户!)获得我的代码:http://thecodeabode.blogspot.com/2011/01/detect-adobe-reader-plugin.html

该代码在 Windows 7 上的 IE11 之前运行良好，它在 getAcrobatVersion 中返回 null。

这是完整的代码，这样对大家来说更容易:

var getAcrobatInfo = function() {

      var getBrowserName = function() {
        return this.name = this.name || function() {
          var userAgent = navigator ? navigator.userAgent.toLowerCase() : "other";

          if(userAgent.indexOf("chrome") > -1)        return "chrome";
          else if(userAgent.indexOf("safari") > -1)   return "safari";
          else if(userAgent.indexOf("msie") > -1)     return "ie";
          else if(userAgent.indexOf("firefox") > -1)  return "firefox";
          return userAgent;
        }();
      };

      var getActiveXObject = function(name) {
        try { return new ActiveXObject(name); } catch(e) {}
      };

      var getNavigatorPlugin = function(name) {
        for(key in navigator.plugins) {
          var plugin = navigator.plugins[key];
          if(plugin.name == name) return plugin;
        }
      };

      var getPDFPlugin = function() {
        return this.plugin = this.plugin || function() {
          if(getBrowserName() == 'ie') {
            //
            // load the activeX control
            // AcroPDF.PDF is used by version 7 and later
            // PDF.PdfCtrl is used by version 6 and earlier
            return getActiveXObject('AcroPDF.PDF') || getActiveXObject('PDF.PdfCtrl');
          }
          else {
            return getNavigatorPlugin('Adobe Acrobat') || getNavigatorPlugin('Chrome PDF Viewer') || getNavigatorPlugin('WebKit built-in PDF');
          }
        }();
      };

      var isAcrobatInstalled = function() {
        return !!getPDFPlugin();
      };

      var getAcrobatVersion = function() {
        try {
          var plugin = getPDFPlugin();

          if(getBrowserName() == 'ie') {
            var versions = plugin.GetVersions().split(',');
            var latest   = versions[0].split('=');
            return parseFloat(latest[1]);
          }

          if(plugin.version) return parseInt(plugin.version);
          return plugin.name

        }
        catch(e) {
          return null;
        }
      }
      // The returned object
      return {
        browser:        getBrowserName(),
        acrobat:        isAcrobatInstalled() ? 'installed' : false,
        acrobatVersion: getAcrobatVersion()
      };
    };

    var info = getAcrobatInfo();
    if(info.acrobat){
        //IE11 will return false even if you have adobe reader because it's a terrible browser.
        document.write('<img src="img/sysChkErr.gif" alt="" border="0">');
        document.write('<span style="color: ' + errCol + '"><strong>Not Installed</strong></span>');
        document.write('<br /><br />Some of our applications require Adobe Reader. You can download Adobe Reader ');
        document.write('<a href="http://get.adobe.com/reader/" target="_blank">here</a>.');
    }else{
        document.write('<img src="img/sysChkPas.gif" alt="" border="0">');
        document.write('<span style="color: ' + pasCol + '"><strong>Installed</strong></span>');
        document.write('<br /><br />Version ' + info.acrobatVersion + ' is installed.');
    }

Answer 1

if(userAgent.indexOf("msie") > -1) 将不再在 IE11 中完成这项工作，因为 the user agent string has changed .对于 IE11，您必须寻找 Trident。

MediaElement.js worked around this像这样:

t.isIE = (nav.appName.match(/microsoft/gi) !== null) || (ua.match(/trident/gi) !== null);

所以我想这可能对您有用？

  else if(userAgent.indexOf("msie") > -1 || userAgent.indexOf("trident") > -1)  return "ie";