<!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>
①<input type="checkbox" name="hobby" id="hobby1"> 音乐<br>
②<input type="checkbox" name="hobby" id="hobby2"> 登山<br>
③<input type="checkbox" name="hobby" id="hobby3"> 游泳<br>
④<input type="checkbox" name="hobby" id="hobby4"> 阅读<br>
⑤<input type="checkbox" name="hobby" id="hobby5"> 打球<br>
⑥<input type="checkbox" name="hobby" id="hobby6"> 跑步<br>
<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(const e of checkboxs()){
e.checked=true;
}
}
function clearall(){
// var hobby = document.getElementsByName("hobby");
for(const e of checkboxs()){
e.checked=false;
}
}
function checkone(){
//可以反选
var j=document.getElementById("wb").value;
var x=document.getElementById("hobby"+j);
x.checked=!x.checked;
//或者可以用 checkboxs()[j-1].checked = !checkboxs()[j-1].checked;
}
function checkboxs () {
return document.getElementsByTagName("input")&&document.getElementsByName("hobby");
}
</script>
</body>
</html>
