demo 

<!doctype html>
<html><head> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    
    <title>select选择-按钮跳转</title> 
    <script type="text/javascript"> 
    function setsubmit() 
    { 
    if(mylink.value == 0){
    
        document.getElementById("1").src = "https://images.cnblogs.com/cnblogs_com/blogs/668126/galleries/1946456/o_210723072828back-to-top.png";
        
    }
    
    if(mylink.value == 1) 
    window.location='http://www.w3cschool.cn'; 
    if(mylink.value == 2) 
    window.location='http://www.w3cschool.cn'; 
    } 
    </script> 
    </head>
    <body>
        <img> 
        <select name="mylink" id="mylink"> 
        <OPTION value="0">A</OPTION> 
        <OPTION value="1">B</OPTION> 
        <OPTION value="2">C</OPTION> 
        </select> 

        <select>
        <option value="">
        </select>
        <input type="button" id="btn" value="提交" onclick="setsubmit(this)" /> 
        <img id="1" src="">
    </body> 
</html>

 

posted @ 2021-07-28 21:07  limited_Infinite  阅读(23)  评论(0)  编辑  收藏  举报
// //返回顶部 //返回顶部按钮