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谁能告诉我哪里错了啊？谢谢

<!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(i=0;i<hobby.length;i++){
                if(hobby[i].type=="checkbox"){
                    hobby[i].checked=true;
                }
            }

          // 任务1

        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            for(i=0;i<hobby.length;i++){
                hobby[i].checked=false;
            }

            }
         // 任务2

        }

        function checkone(){
            var j=document.getElementById("wb").value;
            var hobby=document.getElementById("hobby"+j);
            hobby.checked=true;

        }

        </script>
    </body>
</html>

海贼12345

2015-07-21

源自：JavaScript进阶篇 9-4

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4 回答

浅水了
2015-07-21

function checkall(){
            var hobby = document.getElementsByTagName("input");
            for(i=0;i<hobby.length;i++){
                if(hobby[i].type=="checkbox"){//把if判断去掉。
                    hobby[i].checked=true;
                }
            }
            
              // 任务1 
           
        }//这里多了一个大括号