JS统制TD字体颜色

<html>
	<head>
		<script type="text/javascript">
			window.onload= function(){
				document.getElementById("td1").style.color ="red";
			}
		</script>
	</head>
	<body>
		<table border = "1">
			<tr>
				<td id = "td1">1</td>
				<td>1</td>	
			</tr>
			<tr>
				<td>1</td>
				<td>1</td>	
			</tr>
		</table>
	</body>
</html>