!DOCTYPE htmlhtml lang="en"head meta charset="UTF-8" title全选与全不选/title/headbodyform 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="ch
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>全选与全不选</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");
//alert(hobby.length);
for(var i= 0,j = 6;i<j;i++)
{
hobby[i].checked = true;
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
//alert(hobby.length);
for(var i= 0,j=hobby.length;i<j;i++)
{
hobby[i].checked = false;
}
}
function checkone(){
clearall();
var j=document.getElementById("wb").value;
document.getElementById("hobby"+j).checked = true;
}
</script>
</body>
</html>