<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
ul{
list-style: none;
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<ul id="list">
<li><input type="checkbox" name="basketball">篮球</li>
<li><input type="checkbox" name="basketball">足球</li>
<li><input type="checkbox" name="basketball">排球</li>
<li><input type="checkbox" name="basketball">网球</li>
</ul>
<input id="all" type="checkbox" name="all">全选
<br>
<button type="button">反选</button>
<script type="text/javascript">
var oList = document.getElementById('list');
var aInp = oList.getElementsByTagName('input');
var oBtn = document.getElementsByTagName('button')[0];
var oAll = document.getElementById("all");
var onOff = true;
oAll.onclick = function() {
if(onOff){
for (var i = 0; i < aInp.length; i++) {
aInp[i].checked = true;
}
}
else{
for (var i = 0; i < aInp.length; i++) {
aInp[i].checked = false;
}
}
onOff = !onOff;
}
for(var i = 0;i<aInp.length;i++){
aInp[i].onclick = function(){
for(var j = 0;j<aInp.length;j++){
if(!aInp[j].checked){
oAll.checked = false;
onOff = true;
return;
}
}
oAll.checked = true;
onOff = false;
}
}
oBtn.onclick = function(){
for(var i = 0;i<aInp.length;i++){
aInp[i].checked = !aInp[i].checked;
}
}
</script>
</body>
</html>
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