​x
 
<!DOCTYPE html>
<html>
<body>
​
<p><bdo id="myBdo" dir="ltr">本段从左到右。</bdo></p>  
​
<p>单击该按钮可更改 bdo 元素内文本的文本方向。</p>
​
<button onclick="myFunction()">试一试</button>
​
<script>
function myFunction() {
  document.getElementById("myBdo").dir = "rtl";
}
</script>
​
</body>
</html>
​