<!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>复选框全选</title>
</head>
<body>
<input type="checkbox" name="sex" id="selectAll">全选
<br>
<div class="check">
<input type="checkbox" name="sex" id="">
<input type="checkbox" name="sex" id="">
<input type="checkbox" name="sex" id="">
<input type="checkbox" name="sex" id="">
</div>
<script>
//获取全选按钮
var selectAll = document.getElementById("selectAll");
//获取复选框
var check = document.querySelector(".check").querySelectorAll("input");
selectAll.onclick = function () {
/* console.log(this.checked); */
//this.checked返回一个布尔值,如果为true则表示该选框被选中,否则未被选中
for (var i = 0; i < check.length; i++) {
check[i].checked = this.checked;
}
}
/*
复选框都被选中,全选框才会被选中,每点击一次复选框,就对复所有的选框遍历一次,判断是否所以的复选框被选中,如果都被选中那么全选框也被选中,否则全选框不被选中
*/
for (var i = 0; i < check.length; i++) {
check[i].onclick = function () {
//控制全选按钮是否被选中
var flag = true;
for (var i = 0; i < check.length; i++) {
if (!check[i].checked) {
flag = false;
//可有可无,主要为了提高效率
break;
}
}
selectAll.checked = flag;
}
}
</script>
</body>
</html>
表单按钮全选与取消全选
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转载自blog.csdn.net/heart_is_broken/article/details/121096885
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