<!DOCTYPE HTML> <html>...-慕课网

                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript进阶篇

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<script type="text/javascript">
  document.write(navigator.appName+"<br>")
  document.write(navigator.appVersion+"<br>")
  document.write(navigator.platform+"<br>")
  document.write(navigator.userAgent)
</script>
<body>
</body>
</html>