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<!DOCTYPE html> <html> <body> <p id="myP" lang="en">单击该按钮可显示此 p 元素的语言代码。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myP").lang; document.getElementById("demo").innerHTML = x; } </script> </body> </html>