怎么获取复选框下面的值
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".btn").click(function(){
$(".yc_div").css('display','block');
})
$(".queren").click(function(){
$(".yc_div").css('display','none');
})
$(".box_input").click(function(){
$(this).parent().next(".ts_z2").toggle();
});
});
</script>
<style type="text/css">
*{
margin:0;
padding:0;
}
body{
font-size:12px;
}
li{
list-style:none;
}
.btn{
float:left;
}
.div{
width:400px;
height:100px;
float:left;
border:1px solid #066;
}
.yc_div{
width:400px;
height:300px;
border:1px solid #09C;
position:absolute;
top:50%;
left:50%;
margin-left:-200px;
margin-top:-150px;
display:none;
}
.yc_div li{
float:left;
}
.ts_z1{
width:400px;
height:25px;
float:left;
margin-top:10px;
display:inline;
line-height:25px;
}
.ts_z1 .box_input{
vertical-align:middle;
}
.ts_z2{
width:400px;
height:35px;
float:left;
margin-top:10px;
display:inline;
}
.ts_z2 .text_input{
width:200px;
height:30px;
border:1px solid #DCDCDC;
margin-left:25px;
vertical-align:middle;
}
</style>
</head>
<body>
<a class="btn" href="javascript:;">点击添加</a>
<div class="div"></div>
<div class="yc_div">
<ul>
<li>
<div class="ts_z1">
<input class="box_input" type="checkbox" /> 外景
</div>
<div class="ts_z2" style="display:none;">
<input class="text_input" type="text" />
</div>
</li>
<li>
<div class="ts_z1">
<input class="box_input" type="checkbox" /> 外景
</div>
<div class="ts_z2" style="display:none;">
<input class="text_input" type="text" />
</div>
</li>
<li>
<input class="queren" type="button" value="确认" />
</li>
</ul>
</div>
</body>
</html>
$(".queren").click(function() {
var data ='';
$(".yc_div").css('display', 'none');
var $a = $('.box_input');
$a.each(function(k,v){
var $c = $(this);
var $b = $c.prop('checked');
if($b){
var dFText = this.nextSibling.nodeValue;
var dLText = $c.parent().next().find('.text_input').val();
var dd = dFText + ':' + dLText;
data +=dd;
}
});
$('.div').html(data);
//var $b = $a.prop('checked');
})