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<!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"); if (x.dir === "rtl") { document.getElementById("demo").innerHTML = "文本方向是从右到左。"; } else { document.getElementById("demo").innerHTML = "文本方向是从左到右。"; } } </script> </body> </html>