HTML --JS 选择框

 1 <html>
 2     <head>
 3         <title>选择框</title>
 4         <script language="JavaScript"> 
 5             
 6             function change(rurl){
 7                 window.location=rurl;
 8             }
 9             function myFunction(){
10                 var x;
11                 var r=confirm("按下按钮!");
12                 if (r==true){
13                     x="你按下了"确定"按钮!";
14                 }
15                 else{
16                     x="你按下了"取消"按钮!";
17                 }
18                 document.getElementById("demo").innerHTML=x;
19             }
20         </script>
21     </head>
22     <body>
23         <p>点击按钮，显示确认框。</p>
24         <button onclick="myFunction()">点我</button>
25         <p id="demo"></p>
26         
27         <select onchange="change(this.value)">
28             <option value="#">请选择要浏览的网页</option>
29             <option value="http://www.baidu.com">百度</option>
30             <option value="http://www.taobao.com">淘宝</option>
31             <option value="http://www.jingdong.com">京东</option>
32         </select>
33     
34     
35     </body>
36 </html>