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<!DOCTYPE html> <html> <body> <iframe id="myframe" src="/default.asp" name="iframe_a"></iframe> <p>单击该按钮以返回 iframe 的名称。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myframe").name; document.getElementById("demo").innerHTML = x; } </script> </body> </html>