css选择器的学习
有类选择器，id选择器，标签选择器，子类选择器，父类选择器等
<style type="text/css">
.box{width: 120px;height: 250px;border: 1px solid #000;border-radius: 5px;padding: 5px 10px;margin: 20px auto;}
.box div{border-bottom: 1px solid #000;padding-bottom: 10px;margin-bottom: 8px;}
.box input{margin: 8px;}
</style>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<div class="box">
<div>
<input type="checkbox" id="checkall" onclick="checkAll()"><label for="checkall">全选</label>
</div>
<input type="checkbox" name="item[]">选项1<br>
<input type="checkbox" name="item[]">选项2<br>
<input type="checkbox" name="item[]">选项3<br>
<input type="checkbox" name="item[]">选项4<br>
<input type="checkbox" name="item[]">选项5<br>
<input type="checkbox" name="item[]">选项6<br>
</div>
</body>
</html>
<script type="text/javascript">
function checkAll(){
var checkall = document.getElementById('checkall');
var item = document.getElementsByName('item[]');
for(var i = 0;i < item.length ; i++)
{
if(checkall.checked){
item[i].checked = true;
}else{
item[i].checked = false;
}
}
}
</script>