<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
window.onload = function(){
selAll = document.getElementById("selAll");
hobbys = document.getElementsByName("hobby");
fx = document.getElementById("fx"); //全选事件
selAll.onclick = function(){
//全选
if(selAll.checked == true){
for (var i=0;i<hobbys.length;i++) {
hobbys[i].checked = true;
}
}else{
for (var i=0;i<hobbys.length;i++) { hobbys[i].checked = false;
}
}
} //反选
fx.onclick = function(){
for (var i=0;i<hobbys.length;i++) { var b = hobbys[i]; if(b.checked == true){
b.checked = false;
}else{
b.checked = true;
}
}
}
} </script>
</head>
<body>
<input type="checkbox" name="" id="selAll" />全选
<button id="fx">反选</button>
<br>
<input type="checkbox" name="hobby" />篮球
<input type="checkbox" name="hobby" />足球 <input type="checkbox" name="hobby" />乒乓球 <input type="checkbox" name="hobby" />羽毛球 </body></html>