<!DOCTYPE?HTML><html>????<head>????????<meta?http-equiv="Content-Type"?content="text/html;?charset=gb2312">????????<title>無標(biāo)題文檔</title>????</head>????????<body>????????<form>??????????請(qǐng)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(qǐng)輸入您要選擇愛好的序號(hào)，序號(hào)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");?????????????????????//?任務(wù)1?????????????for(var?i?=?0;i<hobby.length;i++){????????????????hobby[i].checked?=?true;????????????}????????}????????function?clearall(){????????????var?hobby?=?document.getElementsByName("hobby");?????????????????????//?任務(wù)2????????????????for(var?i?=?0;i<hobby.length;i++){????????????????hobby[i].checked?=?false;????????????}????????}????????????????function?checkone(){????????????var?j=document.getElementById("wb").value;?????????????????//?任務(wù)3????????????var?arr=j.split("");????????????for(var?i?=?0;i<j.length;i++){????????????????var?k=parseInt(arr[i]);????????????????hobby[k].checked?=?true;????????????}????????}????????????????</script>????</body></html>
2017-02-04
var?hobby?=?document.getElementsByName("hobby");已自行解決，任務(wù)三少了一句代碼。
2017-02-04
var?hobby?=?document.getElementsByName("hobby");