Iframe is cross-domain. There is no way to get iframe sub-page elements.

for example, my own website www.aaa.com, uses iframe to introduce www.bb.com (other people"s websites, which I can"t control).
can you get this?

Html5 html javascript
Mar.24,2022
The influence of

homologous policy cannot be realized at the front end. If you can manipulate the elements of a child page casually, it will be very dangerous for the pages in iframe .

if you really want to manipulate the elements in iframe , try using the nginx agent to implement

.

method one

write your page configuration and proxy forwarding configuration in a server , distinguish between different location , so that their domain names are the same, and there is no cross-domain problem. In this way, if you want to adjust the access path of the static problem of the proxy page, the example will not give

.

method two

write two server and server1 assuming the domain name is aaa.xxx.com and act as a proxy. When returning, insert a js code to modify domain=xxx.com , server2 assume the domain name is bbb.xxx.com , use it as your page, and set domain=xxx.com in front of the page.

here's an example: aaa.xxx.com Agent www.qq.com , bbb.xxx.com iframe reference aaa.xxx.com , and get the element

of iframe

first is server configuration

of nginx 
server {
    listen       80;
    server_name  aaa.xxx.com;

    location / {
        proxy_pass  https://www.qq.com/;
        proxy_set_header Host www.qq.com;
        proxy_set_header X-Forwarded-For $remote_addr;

        -sharp (:)
        proxy_set_header Accept-Encoding '';

        -sharp  JS  --with-http_sub_module 
        sub_filter '</head>' '</head><script>document.domain = \'xxx.com\';</script>';
        sub_filter_once off;   
    }
}
server {
    listen       80;
    server_name  bbb.xxx.com;
    root /home/www/bbb.xxx.com;

    location / {
    }
}

then write a test code / home/www/bbb.xxx.com/index.html 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
  <iframe style="width: 100%;height: 100%" id="iframe" src="http://aaa.xxx.com"></iframe>
</body>
<script>
  document.domain = 'xxx.com';
  var iframe = document.getElementById('iframe');
  iframe.onload = function(){
    //  iframe  id  sosobar 
    console.log('iframe', iframe.contentWindow.document.getElementById('sosobar'));
  }
</script>
</html>

start Nginx , visit bbb.xxx.com to view the results

clipboard.png

as you can see, iframe has achieved cross-domain implementation, but in doing so, some problems cannot be ignored

  • https question
  • site has detection code
  • JS , CSS , png loaded through independent domain names, may have cross-domain or permission problems
  • changed domain so that some resources cannot be obtained

ps:, if you have a good solution, you are welcome to share

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