跟同学代码核对过了没有问题,为什么运行不出来

来源:9-4 区别getElementByID,getElementsByName,getElementsByTagName

qq_喵哩个喵_0

2019-01-30 10:18

<!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");
            for(var i=0;i<hobby.length;i++){
                if(hobby[i].style=='checkbox'){
                    hobby[i].checked=true;
                }
            }
          // 任务1
          
        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            for(var i=0;i<hobby.length;i++){
                hobby[i].checked=false;
            }
           
         // 任务2   
           
        }
        var hobby3=document.getElementsByName("hobby");
        function checkone(){
            clearall();
            var j=document.getElementById("wb").value;
            var hobby3=document.getElementsByName("hobby");
            switch(j)
            case 1:
                document.getElementById("hobby1").checked=true;
                break;
            case 2:
                document.getElementById("hobby2").checked=true;
                break;
            case 3:
                document.getElementById("hobby3").checked=true;
                break;
            case 4:
                document.getElementById("hobby4").checked=true;
                break;
            case 5:
                document.getElementById("hobby5").checked=true;
                break;
            case 6:
                document.getElementById("hobby6").checked=true;
                break;
       
         // 任务3
       
        }
       
        </script>
    </body>
</html>

写回答 关注

2回答

  • 夜枫Y
    2019-01-30 11:31:50

    任务三中的

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

    改成

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


  • 夜枫Y
    2019-01-30 10:59:09

    任务一中的if 判定应为 (hobby[i].type == "checkebox")

JavaScript进阶篇

本课程从如何插入JS代码开始,带您进入网页动态交互世界

468195 学习 · 21891 问题

查看课程

相似问题