javascript问题，没有id以及class情况下，javascript怎么动态获取与替换？

假设html代码如下，需要替换<script里的src链接
就是把aa/bb/code.js?tenkey替换成cc/dd/code.js?tenkey

src里只有code.js?是固定类型

<!DOCTYPE html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <title> 问 题</title>
 </head>
 <body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script src="aa/bb/code.js?tenkey" type="text/javascript"></script>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
 </body>
</html>

请采纳


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script src="aa/bb/code.js?tenkey" type="text/javascript"></script>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
    window.onload = function () {
        document.querySelector("script").src = "aaaaaaaaaaaaaaa"
    }
</script>
</body>
</html>

document.querySelector("script").src = 'cc/dd/code.js?tenkey'

有也是很不好，如果有多个srcpit还得用下标获取