在table自增一行，删除一行

<script language="javascript" src="jquery-latest.pack.js"></script> <table border="1px #ooo" id="fdeextest" name="choooek" class="chook" cellpadding="0" cellspacing="0" width="20%"> <tr id="t1">    <td width="30%"><input type="checkbox" name="checkbox" value="1"     onclick="addordeltr(this.checked,'test',this.value);" />1</td>    <td width="30%">2</td>    <td width="30%">3</td> </tr> <tr id="t211">    <td width="30%"><input type="checkbox" name="checkbox"     value="211" onclick="addordeltr(this.checked,'test',this.value);" />211</td>    <td width="30%">22</td>    <td width="30%">33</td> </tr> <tr id="t311">    <td width="30%"><input type="checkbox" name="checkbox"     value="311" onclick="addordeltr(this.checked,'test',this.value);" />311</td>    <td width="30%">322</td>    <td width="30%">333</td> </tr> </table> <hr /> <table border="1px #ooo" id="test" cellpadding="0" cellspacing="0" width="20%"> <tr id="1">    <td colspan="3">没数据</td> </tr> </table> <table border="1px #ooo" id="testPPPP" name="testOOOO" cellpadding="0" cellspacing="0" width="20%"> <tr id="4">    <td width="30%">1</td>    <td width="30%">2</td>    <td width="30%">3</td> </tr> </table> <input type="button" name="button" value="add" onclick="addtr('test');"> <input type="button" name="button" value="del" onclick="deltr('test');"> <script> //在id为test的table的最后增加一行 function addtr(id,idValues){ tr_id = $("#test>tbody>tr:last").attr("id"); tr_id++; //alert(tr_id); str = "<tr id = '" + idValues + tr_id+"'><td width='30%'>"+idValues+"</td><td width='30%'>re2</td><td width='30%'>re3</td></tr>"; $('#'+id).append(str); } //删除id为test的table的最后一行 function deltr(id){ tr_id = $("#test>tbody>tr:last").attr("id"); $('#'+tr_id).remove(); } function addordeltr(yn,id,idValues){ if(yn){    addtr(id,idValues); }else{    deltr(id); } } </script>