检查脚本打开的窗口是否关闭

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
  </head>
  <body>
    <button >打开窗口</button>
    <button >检测</button>
    <script src="./index.js"></script>
  </body>
</html>

index.js

const btn1 = document.getElementById("btn1");
const btn2 = document.getElementById("btn2");
let targetWindow = null;

btn1.addEventListener("click", function () {
  targetWindow = window.open("http://www.baidu.com");
});

btn2.addEventListener("click", function () {
  if (targetWindow) {
    if (targetWindow.closed) {
      alert("窗口已经关闭");
    } else {
      alert("窗口还未关闭");
    }
  } else {
    alert("窗口还未打开过");
  }
});

检查脚本打开的窗口是否关闭

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