test.html

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"/>
		<title>IE6-IE9中tbody的innerHTML不能复制bug</title>
	</head>
	<body style="height:3000px">
        <table id="t1">
            <tbody>
                <tr><td>aaa</td></tr>
            </tbody>
        </table>
        <p>
            <button id="btn1">GET</button><button id="btn2">SET</button>
        </p>
    	<script>
            var tbody = document.getElementsByTagName('tbody')[0]
            function setTbody() {
                tbody.innerHTML = '<tr><td>bbb</td></tr>'
            }
            function getTbody() {
                alert(tbody.innerHTML)
            }
            btn1.onclick = function() {
                getTbody()
            }
            btn2.onclick = function() {
                setTbody()
            }

            t1.innerHTML = '<tr><td>xxx</td></tr>'

    	</script>
	</body>
</html>