实现功能让iframe加载完成后阻断网页加载htmlmeta content=width=device-width initial-scale=10 maximum-scale=10 user-scalable=0 name=viewport titlefhcstitlebody style=margin0;padding0;height100 scroll=noiframe id=infrm n

<script>
window.onload = function() {
  var iframe = document.getElementById("infrm");
  iframe.onload = function() {
    document.body.innerHTML = "<h1>网页加载已被阻断</h1>";
  }
}
</script>