<!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>全选反选</title>
<style>
* {
padding: 0;
margin: 0;
}
.wrap {
width: 300px;
margin: 100px auto 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
border: 1px solid #c0c0c0;
width: 300px;
}
th,
td {
border: 1px solid #d0d0d0;
color: #404060;
padding: 10px;
}
th {
background-color: #09c;
font: bold 16px "微软雅黑";
color: #fff;
}
td {
font: 14px "微软雅黑";
}
tbody tr {
background-color: #f0f0f0;
}
tbody tr:hover {
cursor: pointer;
background-color: #fafafa;
}
</style>
</head>
<body>
<div class="wrap">
<table>
<thead>
<tr>
<th>
<input type="checkbox" id="j_cbAll" />
</th>
<th>商品</th>
<th>价钱</th>
</tr>
</thead>
<tbody id="j_tb">
<tr>
<td>
<input type="checkbox" />
</td>
<td>iPhone8</td>
<td>8000</td>
</tr>
<tr>
<td>
<input type="checkbox" />
</td>
<td>iPad Pro</td>
<td>5000</td>
</tr>
<tr>
<td>
<input type="checkbox" />
</td>
<td>iPad Air</td>
<td>2000</td>
</tr>
<tr>
<td>
<input type="checkbox" />
</td>
<td>Apple Watch</td>
<td>2000</td>
</tr>
</tbody>
</table>
<input type="button" value=" 反 选 " id="btn">
</div>
<script>
var allCk=document.getElementById('j_cbAll');
var tbody=document.getElementById('j_tb');
var inputs=tbody.getElementsByTagName('input');
var btn =document.getElementById('btn');
allCk.onclick=function(){
for(var i = 0 ; i< inputs.length;i++){
if(inputs[i].type==='checkbox'){
inputs[i].checked=this.checked;
}
}
}
btn.onclick=function(){
for(var i =0 ; i < inputs.length;i++){
if(inputs[i].type==='checkbox'){
inputs[i].checked=!inputs[i].checked;
}
}
isAllcheck();
}
for(var i= 0 ; i< inputs.length;i++){
inputs[i].onclick=isAllcheck;
}
function isAllcheck(){
var flag=true;
for(var i =0; i<inputs.length;i++){
if(inputs[i].checked===false){
flag=false;
}
}
allCk.checked=flag;
}
</script>
</body>
</html>