<!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>
<style>
</style>
<body>
<form name="form1" method="post" action="">
<input type="checkbox" id="btn1" >全选
<br>
<input type="checkbox" class="checkbox" value="checkbox1">
checkbox1
<input type="checkbox" class="checkbox" value="checkbox2">
checkbox2
<input type="checkbox" class="checkbox" value="checkbox3">
checkbox3
<input type="checkbox" class="checkbox" value="checkbox4">
checkbox4
</form>
</body>
</html>
<script>
let inp=document.getElementsByClassName('checkbox');
let btn1=document.getElementById('btn1');
//全选
btn1.onclick=function()
{
for (let i = 0; i < inp.length; i++) {
inp[i].checked=btn1.checked;
}
}
//给每个小复选框添加点击事件
for (let i = 0; i < inp.length; i++) {
inp[i].onclick=function()
{
//每次点击都循环判断是否全部选中
let coun=true;
for (let j = 0; j < inp.length; j++) {
if(!inp[j].checked)
{
coun=false;
}
}
btn1.checked=coun;
}
}
</script>
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/278672.html