                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript进阶篇

完整代码！！

<!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].type == 'checkbox')
                {
                    hobby[i].checked = true;
                }
            }
        }
        function clearall(){
            var hobby = document.getElementsByName("hobby");
            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");
            hobby[j-1].checked = true;
        
        }
        
        </script>
    </body>
</html>