为什么不能改红色；
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>认识语句</title>
<script type="text/javascript">
document.write("hello").style.color="red";
document.write("world");
</script>
</head>
<body>
</body>
</html>
认识语句
