全选，全部选，反选
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>按钮选择器</title>
<style>
table {
margin-top: 200px;
text-align: center;
}
tr,
th {
height: 50px;
}
div {
margin-top: 50px;
margin-left: 40%;
}
</style>
</head>
<body>
<table border="1px" width="500px" cellspacing="0" align="center">
<caption><h2>学生表</h2></caption>
<tr>
<th><input type="checkbox" name="cb" id="fist_select"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>操作</th>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>1</td>
<td>孔子</td>
<td>男</td>
<td>删除</td>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>1</td>
<td>孔子</td>
<td>男</td>
<td>删除</td>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>1</td>
<td>孔子</td>
<td>男</td>
<td>删除</td>
</tr>
<tr>
<td><input type="checkbox" name="cb"></td>
<td>1</td>
<td>孔子</td>
<td>男</td>
<td>删除</td>
</tr>
</table>
<div>
<input type="button" id="selectall" value="全选">
<input type="button" id="noselectall" value="全不选">
<input type="button" id="unSelect" value="反选">
</div>
<script>
//浏览器对象加载完毕
window.onload= function() {
//按钮点击事件
document.getElementById("selectall").onclick = function() {
//获取所有的复选框按钮
var cbs = document.getElementsByName('cb');
//遍历数组
for (var i = 0; i < cbs.length; i++) {
//checked 属性设置或返回 checkbox 是否应被选中。
//checkboxObject.checked=true|false
//调用checked() 方法
cbs[i].checked = true;
}
}
document.getElementById("noselectall").onclick = function() {
var cbs = document.getElementsByName('cb');
for (var i = 0; i < cbs.length; i++) {
cbs[i].checked = false;
}
}
document.getElementById("unSelect").onclick = function() {
var cbs = document.getElementsByName('cb');
for (var i = 0; i < cbs.length; i++) {
cbs[i].checked = !cbs[i].checked;
}
}
document.getElementById("fist_select").onclick = function() {
var cbs = document.getElementsByName('cb');
for (var i = 0; i < cbs.length; i++) {
cbs[i].checked = this.checked;
}
}
}
</script>
</body>
</html>
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