代码
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title></title>
<script>
window.onload=function(){
var selAll=document.getElementById("selAll");
var hobbys=document.getElementsByName("hobby");
var fx=document.getElementById("fx");
var myClick=document.getElementById("xz");
function myClick(){
alert("hello");
}
//全选事件
selAll.onclick=function(){
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;
}
}
}
//反选事件
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>
<span onclick="myClick()" id="xz"><input type="checkbox" id="selAll"/>全选</span>
<button id="fx">反选</button></br>
<input type="checkbox" name="hobby" />羽毛球
<input type="checkbox" name="hobby"/>绘画
<input type="checkbox" name="hobby"/>唱歌
<input type="checkbox" name="hobby"/>跳舞
</body>
</html>
