这新添加的add 对象后里面的删除操作点击无响应，是为啥？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/jquery-1.11.3.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(function(){
$("table tr td a").click(function(){
$(this).parent().parent().remove();
});
$("#add").click(function(){
var add = "<tr><td>Data</td><td>Data</td><td>Data</td><td><a href='#'>删除</a></td></tr>"
var jq = $(add);
$("table").append(add);
});
});
</script>
</head>
<body>
<table border="" cellspacing="" cellpadding="">
<tr>
<td>Data</td>
<td>Data</td>
<td>Data</td>
<td>
<a href="#">删除</a>
</td>
</tr>
<tr>
<td>Data</td>
<td>Data</td>
<td>Data</td>
<td>
<a href="#">删除</a>
</td>
</tr>
<tr>
<td>Data</td>
<td>Data</td>
<td>Data</td>
<td>
<a href="#">删除</a>
</td>
</tr>
<tr>
<td>Data</td>
<td>Data</td>
<td>Data</td>
<td>
<a href="#">删除</a>
</td>
</tr>
<tr>
<td>Data</td>
<td>Data</td>
<td>Data</td>
<td>
<a href="#">删除</a>
</td>
</tr>
</table>
<a href="#" id="add">添加</a>
</body>
</html> 
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