                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /JavaScript進(jìn)階篇

請問我這個(gè)哪里有問題？

<!DOCTYPE HTML>
<html>
??? <head>
??????? <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
??????? <title>無標(biāo)題文檔</title>
??? </head>
?? ?
??? <body>
??????? <form>
????????? 請選擇你愛好:<br>
????????? <input type="checkbox" name="hobby" id="hobby1">? 音樂
????????? <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">? 閱讀
????????? <input type="checkbox" name="hobby" id="hobby5">? 打球
????????? <input type="checkbox" name="hobby" id="hobby6">? 跑步 <br>
????????? <input type="button" value = "全選" onclick = "checkall();">
????????? <input type="button" value = "全不選" onclick = "clearall();">
????????? <p>請輸入您要選擇愛好的序號，序號為1-6:</p>
????????? <input id="wb" name="wb" type="text" >
????????? <input name="ok" type="button" value="確定" onclick = "checkone();">
??????? </form>
??????? <script type="text/javascript">
??????? function checkall(){
??????????? var hobby = document.getElementsByTagName("input");
??????????? for(var i=0;i<hobby.length;i++){
??????????????? hobby[i].checked=true;
??????????? }
????????? // 任務(wù)1
????????? ?
??????? }
??????? function clearall(){
??????????? var hobby = document.getElementsByName("hobby");
??????????? for(var i=0;i<hobby.length;i++){
??????????????? hobby[i].checked=false;
??????????? }
???????? // 任務(wù)2?? ?
?????????? ?
??????? }
?????? ?
??????? function checkone(){
??????????? var j=document.getElementById("wb").value;
??????????? var hobby = document.getElementsByName("hobby");
??????????? for(var i=0;i<j.length;i++){
??????????????? if(j.charAt(i)>6||j.charAt(i)<1){
??????????????????? alert("輸入錯(cuò)誤！")；
??????????????????? document.getElementById("wb").value="";
??????????????? }
??????????? }
??????????? for(var n=0;n<j.legth;n++){
??????????????? hobby[(j.charAt(n))-1].checked=true;
??????????? }
????????? //任務(wù)3?? ?
??????? }
?????? ?
??????? </script>
??? </body>
</html>