<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>
<input type="checkbox" id="all">全选<br>
</div>
<div id="tb">
<input type="checkbox">1 <br>
<input type="checkbox">2 <br>
<input type="checkbox">3 <br>
<input type="checkbox">4 <br>
</div>
<div>
<input type="button" value="反选" id="btn">
</div>
</table>
<script>
var all = document.getElementById("all");
var tb = document.getElementById("tb");
var tb_inputs = tb.getElementsByTagName("input");
var btn = document.getElementById("btn");
//全选
all.onclick = function () {
for (var i = 0; i < tb_inputs.length; i++) {
tb_inputs[i].checked = all.checked;
}
};
//单独选择子选项过程
for (var i = 0; i < tb_inputs.length; i++) {
tb_inputs[i].onclick = function () {
// 假设初始状态每个子选项都是被选中的
allChecked();
}
}
//反选
btn.onclick = function () {
for (var i = 0; i < tb_inputs.length; i++) {
tb_inputs[i].checked = !tb_inputs[i].checked;
}
// 全选控制
allChecked();
}
function allChecked(){
// 假设初始状态每个子选项都是被选中的
var isAllChecked = true;
for (var j = 0; j < tb_inputs.length; j++) {
if (tb_inputs[j].checked == false) {
isAllChecked = false;
break;
}
}
all.checked = isAllChecked;
}
</script>
</body>
</html>
