<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML...-慕课网

                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript进阶篇

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
">

<html xmlns="
http://www.w3.org/1999/xhtml
">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>表达式</title>

<script type="text/javascript">

  var num1=10-5;

  var num2=num1+6;

 

  document.write("小明还剩:"+num1+"元"+"<br>");

  document.write("小红花:"+num2+"元买个铅笔盒");

</script>

</head>

<body>

</body>

</html>