<!DOCTYPE html> <html> <body> <h1>Window 对象</h1> <h2>opener 属性</h2> <p id="demo"> 单击按钮可在 opener 窗口中打开一个写有 "HELLO!" 的新窗口。 </p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { const myWindow = window.open("", "", "width=300,height=300"); myWindow.opener.document.getElementById("demo").innerHTML = "HELLO!"; } </script> </body> </html>