JS实现全选
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JS-demo</title>
<style>
.box{width:120px; height:250px;border:1px solid #ccc; border-radius:5px; padding:5px 10px; margin:20px auto;}
.box div{border-bottom:1px solid #ccc; padding-bottom:10px;}
.box input{margin:8px;}
</style>
</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[]">选项一<br>
<input type="checkbox" name="item[]">选项二<br>
<input type="checkbox" name="item[]">选项三<br>
<input type="checkbox" name="item[]">选项四<br>
<input type="checkbox" name="item[]">选项五<br>
<input type="checkbox" name="item[]">选项六<br>
</div>
</body>
<script type="application/javascript">
function checkAll(){
var checkall,item;
checkall=document.getElementById('checkall')
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>
</html>
//练习时，变量名checkall，书写错误，导致无法实现功能，看了好半天才发现。。。。。拼写不规范，查找两行泪