jQuery(5)--实现checkbox的全选,反选，全不选功能

页面如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>demo04.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="this is my page">

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

<script type="text/javascript" src="../js/jquery-1.9.1.js"></script>

<script type="text/javascript">

$(document).ready(function(){

$("#ckbAll").click(function(){

$("input[name='fav']").attr("checked",true);

});

$("#ckbno").click(function(){

$("input[name='fav']").attr("checked",false);

});

$("#ckbrec").click(function(){

$("input[name='fav']").each(function(){

// $(this).attr("checked",!$(this).attr("checked"));

this.checked=!this.checked;//用的是Dom的属性

});

});

});

</script>

</head>

<body>

<div>

<input type="checkbox" name="fav" value="看书1" checked="checked"/>看书1

<input type="checkbox" name="fav" value="看书2" checked="checked"/>看书2

<input type="checkbox" name="fav" value="看书3" checked="checked"/>看书3

<input type="checkbox" name="fav" value="看书4" checked="checked"/>看书4

</div>

<div>

<input type="button" id="ckbAll" value="全选"/><br/><br/>

<input type="button" id="ckbno" value="全不选"/><br/><br/>

<input type="button" id="ckbrec" value="反选"/><br/>

</div>

</body>

</html>