<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<script>
window.onload = function() {
var selectAll = document.getElementById("selectAll"); // 获取全选元素
var ggs = document.getElementsByName("gg"); //获取checkbox相同名字的集合 // 全选或者不选的时候 调用此函数
function ff(flag) {
for (var i = 0; i < ggs.length; i++) {
ggs[i].checked = flag;
}
} //全选的点击事件，根据点击的状态调用上面函数
selectAll.onclick = function() {
if (selectAll.checked) {
ff(true);
} else {
ff(false);
}
};
};
</script>
</head>
<body>
<ul>
<li><input type="checkbox" name="" id="selectAll" value="" />全选</li>
<li><input type="checkbox" name="gg" id="" value="" />bbbb</li>
<li><input type="checkbox" name="gg" id="" value="" />cccc</li>
<li><input type="checkbox" name="gg" id="" value="" />dddd</li>
<li><input type="checkbox" name="gg" id="" value="" />eeee</li>
<li><input type="checkbox" name="gg" id="" value="" />ffff</li>
</ul>
</body>
</html>