getElementById,getElementsByName,getElementsByTagName实例

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<!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;               }           }        }        function clearall(){            var hobby = document.getElementsByName("hobby");            for(i=0;i<hobby.length;i++){                hobby[i].checked=false;            }                }              function checkone(){            var j=document.getElementById("wb").value;            var hobby = document.getElementById("hobby"+j);            hobby.checked = true;                        }              </script>    </body></html>
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