问答详情
源自:9-4 区别getElementByID,getElementsByName,getElementsByTagName

输入序号值并不能使函数调用,运行结果都是default后面的alert语句

完整代码是:

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
        <title>无标题文档</title>
    </head>
    
    <body>
        <form>
          请选择你爱好:<br>
          <input type="checkbox" name="hobby" id="hobby1">  音乐
          <input type="checkbox" name="hobby" id="hobby2">  登山
          <input type="checkbox" name="hobby" id="hobby3">  游泳
          <input type="checkbox" name="hobby" id="hobby4">  阅读
          <input type="checkbox" name="hobby" id="hobby5">  打球
          <input type="checkbox" name="hobby" id="hobby6">  跑步 <br>
          <input type="button" value = "全选" onclick = "checkall();">
          <input type="button" value = "全不选" onclick = "clearall();">
          <p>请输入您要选择爱好的序号,序号为1-6:</p>
          <input id="wb" name="wb" type="text" >
          <input name="ok" type="button" value="确定" onclick = "checkone();">
        </form>
        <script type="text/javascript">
        function checkall(){
            var hobby = document.getElementsByTagName("input");
           
          // 任务1
          for(var i=0;i<hobby.length;i++){
           hobby[i].checked=true;}
        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            
         // 任务2    
          for(var i=0;i<hobby.length;i++){
              hobby[i].checked=false;
          }  
        }
        
        function checkone(){
            var j = document.getElementById("wb").value;
           var hobby = document.getElementsByName("hobby");
        switch(j){
            case 1:
                hobby[0].checked=true;
                break;
            case 2:
                hobby[1].checked=true;
                break;
            case 3:
                hobby[2].checked=true;
            case 4:
                hobby[3].checked=true;
                break;
            case 5:
                hobby[4].checked=true;
                break;
            case 6:
                hobby[5].checked=true;
                break;
            default:
            alert("请输入1——6整数");
        }
         // 任务3
        
        }
        
        </script>
    </body>
</html>


提问者:weibo_任_无忧_0 2015-11-29 14:08

个回答

  • 李晓健
    2015-11-29 15:04:17
    已采纳

    var j = parseInt(document.getElementById("wb").value);

    把取出来的值转一下数字,不然的话他会认为你给的值都是字符串,然后你和数字比较,肯定都不相等了,所以就一直跳到最后了。

  • echo_kinchao
    2015-11-29 15:52:16

    他报错 的错误代码是什么