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> </head> <body> <a href="https://www.waitang.com/" hreflang="zh-cn" id="runoob">外唐教程网</a><br> <script> document.write("返回链接的hreflang: "); document.write(document.getElementById('runoob').hreflang); document.write("<br><br>"); </script> <a href="http://www.google.com/" id="google">Google</a><br> <script> document.getElementById('google').hreflang="no"; document.write("设置链接的hreflang: "); document.write(document.getElementById('google').hreflang); </script> </body> </html>
运行结果