​x
 
<!DOCTYPE html>
<html>
<body>
​
<p><bdo id="myBdo" dir="rtl">本段将从右到左。</bdo></p>  
​
<p>单击该按钮可获取 bdo 元素内部文本的文本方向。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myBdo").dir;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​