iframe绑定事件。iframe页面a标签跳转，事件丢失

iframe包裹了a页面，页面监听click事件。a页面里a标签跳转到b页面，click事件就不会触发了。有什么办法能在iframe页面解决吗？a、b页面是动态生成的页面

iframe页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    iframe{
        width: 800px;
        height: 600px;
    }
</style>
<body>
    <div id="root">
        <iframe src="./a.html" frameborder="0"></iframe>
    </div>
    <script>
        window.onload=function(){
            console.log(document.querySelector("iframe"));
            
            document.querySelector("iframe").contentWindow.addEventListener('click',(e) => {
                console.log('按下',e)
            })
            
        }
    </script>
</body>
</html>

a页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>a页面</div>
    <a href="./b.html">到b去</a>
</body>
</html>

b页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>b页面</div>
    <a href="./a.html">到a去</a>
</body>
</html>

a，b页面标签添加一个点击事件试试

<a href="./b.html" onclick="return testb(event)">到b去</a>

<script>
function testb(e) {
  e.preventDefault();
   const iframe = parent.document.querySelector('iframe');
  iframe.src = e.target.href;
}
</script>

可以啊， 有没有考虑过 陆游传唱 动态赋值， 听懂给个采纳 加关注