                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript进阶篇

为什么不显示颜色

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>style样式</title>
</head>
<body>
<h2 id="con">I love JavaScript</h2>
<p> JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<script type="text/javascript">
   var mychar=document.getElementById("con");
   mychar.style.color="red";
   mychar.style.backgroundColor="#ccc";
   mychar.style.display="none";
</script>
</body>
</html>