代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>表格全选</title>
<style>
table{
border: 1px solid;
width: 500px;
margin-left: 30%;
}
td,th{
text-align: center;
border: 1px solid;
}
div{
margin-top: 10px;
margin-left: 30%;
}
.out{
background-color: white;
}
.over{
background-color: aqua;
}
</style>
<script>
//页面加载完后绑定事件
window.onload = function () {
//单击全选
document.getElementById("selectAll").onclick = function () {
let cs = document.getElementsByName("c");
for (let i = 0; i < cs.length; i++) {
//设置状态为选中
cs[i].checked = true;
}
}
//全不选
document.getElementById("unSelectAll").onclick = function () {
let cs = document.getElementsByName("c");
for (let i = 0; i < cs.length; i++) {
cs[i].checked = false;
}
}
//反选
document.getElementById("selectRev").onclick = function () {
let cs = document.getElementsByName("c");
for (let i = 0; i < cs.length; i++) {
cs[i].checked = !cs[i].checked;
}
}
document.getElementById("firstC").onclick = function (){
let cs = document.getElementsByName("c");
let first = document.getElementById("firstC");
for (let i = 1; i < cs.length; i++) {
cs[i].checked = first.checked;
}
}
//给所有的tr绑定鼠标移到元素之上和移出元素事件
let trs = document.getElementsByTagName("tr");
//遍历
for (let i = 0; i < trs.length; i++) {
//移到元素之上（鼠标移动到这时）
trs[i].onmouseover = function () {
this.className = "over";
}
//鼠标移开后
trs[i].onmouseout = function () {
this.className = "out";
}
}
}
</script>
</head>
<body>
<table>
<caption>学生信息表</caption>
<tr>
<th><input type="checkbox" name="c" id="firstC"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>操作</th>
</tr>
<tr>
<td><input type="checkbox" name="c"></td>
<td>1</td>
<td>令狐冲</td>
<td>男</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
<tr>
<td><input type="checkbox" name="c"></td>
<td>2</td>
<td>任我行</td>
<td>男</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
<tr>
<td><input type="checkbox" name="c"></td>
<td>3</td>
<td>岳不群</td>
<td>?</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
</table>
<div>
<input type="button" id="selectAll" value="全选">
<input type="button" id="unSelectAll" value="全不选">
<input type="button" id="selectRev" value="反选">
</div>
</body>
</html>
解析：
JS-事件-关于全选