老师授课-3-回答问题

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 <title>无标题文档</title>
 6 
 7 </head>
 8 中国成立于哪一年？<input daan="1949" type="text" value="" id="qq" /><input type="button" value="确定" onclick="check()" /><br />
 9 
10 </body>
11 </html>
12 <script>
13 function check()
14 {
15     var a = document.getElementById("qq");
16     var a1 = a.value;
17     var a2 =a.getAttribute("daan");
18     if(a1==a2)
19     {
20         alert("答对了");    
21     }    
22     else
23     {
24         alert("笨蛋");    
25     }
26 }
27 </script>
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