BootWiki教程网
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>BootWiki 教程网</title> <link href="domoarigato.htm" hreflang="ja" id="link1"> <script> function displayResult(){ var x=document.getElementById("link1").hreflang; alert(x); } </script> </head> <body> <button onclick="displayResult()" type="button">显示链接元素的文档语言</button> </body> </html>
运行结果