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DOM.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>DOM</title>
</head>
<body>
<p>你爱好的运动是</p>
<form method="get">
<input type="checkbox" name="checkall" value="all" />全选
<br />
<br />
<br />
<input type="checkbox" name="items" value="足球" />足球
<input type="checkbox" name="items" value="篮球" />篮球
<input type="checkbox" name="items" value="羽毛球" />羽毛球
<input type="checkbox" name="items" value="乒乓球" />乒乓球
<br />
<button id="btn1" type="button">全选</button>
<button id="btn2" type="button">全不选</button>
<button id="btn3" type="button">反选</button>
<!-- type的值默认为submit了 草 -->
</form>
</body>
<script type="text/javascript">
window.onload = function(){
var choose_all = document.getElementById("btn1");
var choose_no = document.getElementById("btn2");
var choose_rest = document.getElementById("btn3");
var items = document.getElementsByName("items");
var checkall = document.getElementsByName("checkall");
choose_all.onclick = function(){
for (var i=0;i<items.length;i++){
items[i].checked=true;
}
checkall[0].checked = true;
};
choose_no.onclick = function(){
for (var i=0;i<items.length;i++){
items[i].checked=false;
}
checkall[0].checked = false;
};
choose_rest.onclick = function(){
for (var i=0;i<items.length;i++){
items[i].checked=!items[i].checked;
}
if(items[0].checked&&items[1].checked&&items[2].checked&&items[3].checked){
checkall[0].checked = true;
}
else{
checkall[0].checked = false;
}
}
for(var i=0;i<items.length;i++){
items[i].onclick = function(){
if(items[0].checked&&items[1].checked&&items[2].checked&&items[3].checked){
checkall[0].checked = true;
}
else{
checkall[0].checked = false;
}
}
}
checkall[0].onclick = function(){
for (var i=0;i<items.length;i++){
items[i].checked=checkall[0].checked;
}
}
};
</script>
</html>