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<html>
<head>
<script>
function getRecords(){
var num = document.getElementById('num').value;
var _table = document.getElementById('tt');
for(var i=0;i<num;i++){
alert("content:"+_table.rows[i].cells[0].innerHTML);
}
}
</script>
</head>
<body>
<table id="tt">
<tr><td>1</td></tr>
<tr><td>2</td></tr>
<tr><td>3</td></tr>
<tr><td>4</td></tr>
<tr><td>5</td></tr>
<tr><td>6</td></tr>
<tr><td>7</td></tr>
</table>
<input type="text" id="num" >
<input type="button" value="click" onclick="getRecords()">
</body>
</html>