问测试ActiveX控件是否与Javascript一起安装？

EN

function AXOrNull(progId) {
  try {
    return new ActiveXObject(progId);
  }
  catch (ex) {
    return null;
  }
}

function testForActiveX(){
    tester = null;
    try {
        tester = new ActiveXObject('htmlfile');
    }
     catch (e) {
        // catch the exception
    }
    if (tester) {
        // ActiveX is installed
        return true;
    }
    return false;
}

   try{
      if(new ActiveXObject("Nameofplugin")){
        // write your code if plugin available
       }
      else{
       // write your code if plugin is not available
       }
    }
    catch(erro){
    //write your code if plugin is not available
    }