如何调整iframe内容的大小

<iframe src="https://example.com" style="width: 600px; height: 400px;"></iframe>

<style>
  .custom-iframe {
    width: 600px;
    height: 400px;
  }
</style>
<iframe src="https://example.com" class="custom-iframe"></iframe>

<iframe id="myIframe" src="https://example.com"></iframe>
<script>
  document.getElementById('myIframe').style.width = '600px';
  document.getElementById('myIframe').style.height = '400px';
</script>

<iframe src="https://example.com" loading="lazy"></iframe>

<iframe src="https://example.com" sandbox="allow-scripts allow-same-origin"></iframe>

<iframe id="myIframe" src="https://example.com" onload="resizeIframe(this)"></iframe>
<script>
  function resizeIframe(iframe) {
    if (iframe) {
      var iframeWin = iframe.contentWindow || iframe.contentDocument.parentWindow;
      if (iframeWin.document.body) {
        iframe.height = iframeWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight;
      }
    }
  }
</script>