为什么这样获取js不到table节点

<html>
<head>
    <meta charset="UTF-8">
    <title>选择器</title>
    <script language="JavaScript" src="jquery.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            var item=document.getElementById("tb");
        })
    </script>
</head>
<body>
<table id="tb">
    <tbody>
        <tr><td>1</td><td>1</td></tr>
        <tr><td>2</td><td>2</td></tr>
        <tr><td>3</td><td>3</td></tr>
        <tr><td>4</td><td>4</td></tr>
        <tr><td>5</td><td>5</td></tr>
        <tr><td>6</td><td>6</td></tr>
    </tbody>
</table>
</body>
</html>

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