<!DOCTYPE html>
<html>
<body id="myid" dir="rtl">
<script>
var x=document.getElementsByTagName('body')[0];
document.write("文本方向：" + x.dir);
document.write("<br>");
document.write("替代方法：");
document.write(document.getElementById('myid').dir);
</script>
</body>
</html>