JavaScript基础学习 表单全选取消全选效果实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=devcie-width,initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
table {
width: 800px;
margin: 100px auto;
text-align: center;
border-collapse: collapse;
font-size: 14px;
}
thead tr {
height: 30px;
background-color: skyblue;
}
tbody tr {
height: 30px;
}
tbody td {
border-bottom: 1px solid #d7d7d7;
font-size: 12px;
color: blue;
}
.bg {
background-color: pink;
}
</style>
</head>
<body>
<table>
<thead>
<tr>
<th><input type="checkbox" id="th_c"></th>
<th>名称</th>
<th>最新公布值</th>
<th>累计净值</th>
<th>前单位净值</th>
<th>净值增长率</th>
</tr>
</thead>
<tbody id="tbody">
<tr>
<th><input type="checkbox"></th>
<th>农银金穗3个月定期开放债券</th>
<th>1.007</th>
<th>1.009</th>
<th>1.200</th>
<th>0.800</th>
</tr>
<tr>
<th><input type="checkbox"></th>
<th>农银金穗3个月定期开放债券</th>
<th>1.007</th>
<th>1.009</th>
<th>1.200</th>
<th>0.800</th>
</tr>
<tr>
<th><input type="checkbox"></th>
<th>农银金穗3个月定期开放债券</th>
<th>1.007</th>
<th>1.009</th>
<th>1.200</th>
<th>0.800</th>
</tr>
<tr>
<th><input type="checkbox"></th>
<th>农银金穗3个月定期开放债券</th>
<th>1.007</th>
<th>1.009</th>
<th>1.200</th>
<th>0.800</th>
</tr>
</tbody>
</table>
<script>
var thea = document.getElementById('th_c');
var tbod = document.getElementById('tbody').getElementsByTagName('input');
// 获取头部的复选框
thea.onclick = function() {
for (var i = 0; i < tbod.length; i++) {
// 利用循环控制四个小复选框的选中情况，如果头部的被选中，则小复选框也都被选中
tbod[i].checked = this.checked;
}
console.log(this.checked);
}
// 获取四个小复选框
for (var i = 0; i < tbod.length; i++) {
tbod[i].onclick = function() {
var flag = true;
// 检查四个小复选框是否都被选中，都被选中则头部的复选框也被选中，有一个没被选中则头部复选框不被选中
for (var i = 0; i < tbod.length; i++) {
if (!tbod[i].checked) {
flag = false;
break;
}
}
thea.checked = flag;
}
}
</script>
</body>
</html>
