jquery实现表格的搜索功能

<input type="text" id="txt" value="" />
<input type="button" id="btn" value="搜索" />
<table border="1" cellspacing="0" cellpadding="0">
    <thead>
        <tr>
            <th>姓名</th>
            <th>性别</th>
            <th>电话</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>张三</td>
            <td>男</td>
            <td>13112345678</td>
        </tr>
        <tr>
            <td>李四</td>
            <td>男</td>
            <td>1345454548</td>
        </tr>
        <tr>
            <td>王小花</td>
            <td>女</td>
            <td>1234567890</td>
        </tr>
        <tr>
            <td>笑笑</td>
            <td>女</td>
            <td>1098909223</td>
        </tr>
    </tbody>
</table>

table{
    width: 700px;
    border: 1px solid #008000;
    margin: 10px 0 0 0;
    border-collapse: collapse;/*表格边框合并*/
}
tr{
    height: 30px;
    text-align: center;
}
th,td{
    border: 1px solid #008000;
}

$(function () {
    $("#btn").click(function () {
        var $sea=$(‘#txt‘).val();
        //先隐藏全部，再把符合筛选条件的值显示
        $(‘table tbody tr‘).hide().filter(‘:contains(‘+$sea+‘)‘).show();
    });
});