​x
 
<!DOCTYPE html>
<html>
<body>
​
<h3>如何访问 BDO 元素的演示</h3>
​
<p><bdo id="myBdo" dir="rtl">这一段将从右到左。</bdo></p>  
​
<p>单击按钮可获取 bdo 元素内文本的文本方向。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myBdo");
  if (x.dir === "rtl") {
    document.getElementById("demo").innerHTML = "Text direction is right to left.";
  } else {
    document.getElementById("demo").innerHTML = "Text direction is left to right.";
  }
}
</script>
​
</body>
</html>
​