如何只加载PHP & JQuery一次window.open('url')

<script src="path/to/jquery.js"></script>
<script src="path/to/phpfile.php"></script>

var isLoaded = false;

window.open('url');

if (!window.opener.isLoaded) {
  // 加载PHP和JQuery文件
  var script1 = document.createElement('script');
  script1.src = "path/to/jquery.js";
  document.head.appendChild(script1);

  var script2 = document.createElement('script');
  script2.src = "path/to/phpfile.php";
  document.head.appendChild(script2);

  // 更新全局变量isLoaded为true
  window.opener.isLoaded = true;
}