Edit in JSFiddle

$(function () {
            var stime = GetNow();
            $('table').find('tr').children().filter(':nth-child(1)').hide();
            var etime = GetNow();
            var ptime = etime - stime;
            $('#s').text('經過時間' + ptime + '毫秒');


            function GetNow() {
                var d = new Date();
                return d.getTime(); ;
            }
        });

<p><span id='s'></span></p>
<table border='2'>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
    <tr><td>1</td><td>2</td></tr>
</table>