<!DOCTYPE html> <html> <body> <iframe id="myframe" src="/index.php"></iframe> <p>单击按钮以在 iframe 中显示 src 属性的值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myframe").src; document.getElementById("demo").innerHTML = x; } </script> </body> </html>