我在浏览器上看不到按钮



以下 scipt 返回文档(HTML 文档)和窗口的宽度和高度。但它的返回错误。

    <html>
     <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
         </script>
          <script>
            $(document).ready(function(){
             $("button").click(function(){
               var txt="";
              txt+="Document width/height: " + $(document).width();
             txt+="x" + $(document).height() + "n";
              txt+="Window width/height: " + $(window).width();
           txt+="x" + $(window).height();
           alert(txt);
           });
          });
         </head>
              <body>
               <button>Display dimensions of document and window</button>
                  </body>
                      </html>
head 标签

之前缺少结束<script>标签

右边。 缺少</script>替换以下内容

</head>
<body>

</script>
</head>
<body>