基于jQuery实现页面搜索功能

<div class="table">
    <table>
      <tr id="theader">
      <th>姓名</th>
      <th>性别</th>
      <th>联系方式</th>
    </tr>
    <tr>
      <td>客服</td>
      <td>女</td>
      <td>161654466</td>
    </tr>
    <tr>
      <td>掌柜</td>
      <td>男</td>
      <td>37398378737</td>
    </tr>
    <tr>
      <td>小二</td>
      <td>男</td>
      <td>37398378737</td>
    </tr>
    <tr>
      <td>小三</td>
      <td>女</td>
      <td>3464653537</td>
    </tr>
    <tr>
      <td>小四</td>
      <td>女</td>
      <td>37398378737</td>
    </tr>
    </table>
    <input type="text"></input>
    <input type="button" value="搜索"></input>

  </div>

$(function(){
    $("input[type=button]").click(function(){
      var txt=$("input[type=text]").val();
      if($.trim(txt)!=""){

        $("table tr:not('#theader')").hide().filter(":contains('"+txt+"')").show().css("background","red");
      }else{
        $("table tr:not('#theader')").css("background","#fff").show();
      }
    });
  })