W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <body> <iframe src="/example/hdom/frame_a.html" id="frame1"></iframe> <br /><br /> <script type="text/javascript"> document.write("The iframe's id: "); document.write(document.getElementsByTagName("iframe")[0].id); document.write("<br /><br />"); document.write("An alternate way: "); document.write("<br />"); document.write("The iframe's id: "); document.write(document.getElementById("frame1").id); </script> </body> </html>