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();
   }
  });
 })