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function deleteRow(r)
{
var i=r.parentNode.parentNode.rowIndex;
document.getElementById('myTable').deleteRow(i);
var countline = document.getElementById('countline').value - 1;
var x1=document.getElementById('countline').value=countline;
}
function insRow()
{
var countAll = document.getElementById('countAll').value - 1+2;
var countline = document.getElementById('countline').value -1 +2;
var x=document.getElementById('myTable').insertRow(countline);
var y=x.insertCell(0);
var y1=x.insertCell(1);
var y2=x.insertCell(2);
y.innerHTML="<textarea id='aa"+countAll+"' name='bb"+countAll+"' style='width:97%;' rows='2' ></textarea>";
y1.innerHTML="<select id='cc"+countAll+"' name='dd"+countAll+"' style='width:98%;'><option value=''></option></select>";
y2.innerHTML="<textarea id='ee"+countAll+"' name='ff"+countAll+"' style='width:97%;' rows='2' ></textarea>";
var x1=document.getElementById('countline').value=countline;
var x2=document.getElementById('countAll').value=countAll;
}
script type="text/javascript">
function delRow(obj) {
$("#tab tr).last().remove();//从下往上删除行
$("#tab tr).first().remove();//从上往下删除行
}
</script>
</head>
<body>
<!--
<table border="1" id="tab">
<tr id="n1"><td>删除我啊1</td><td><input type="button" value="删除" onclick="delRow(this)"/></td></tr>
<tr id="n2"><td>删除我啊2</td><td><input type="button" value="删除" onclick="delRow(this)"/></td></tr>
<tr id="n3"><td>删除我啊3</td><td><input type="button" value="删除" onclick="delRow(this)"/></td></tr>
</table>
-->
<table border="1" id="tab">
<tr id="n1"><td>删除我啊1</td><td>删除我啊1</td></tr>
<tr id="n2"><td>删除我啊2</td><td>删除我啊2</td></tr>
<tr id="n3"><td>删除我啊3</td><td>删除我啊3</td></tr>
</table>
<input type="button" value="删除" onclick="delRow()"/>