"13" JavaScript cross-domain communication

JavaScript cross-domain communication

Homologous: Two documents of the same origin need to meet

1. Same protocol
2. Same domain name
3. Same port

cross-domain communication methods:
01, by settingimg,script,link,iframe ElementsThe Src,href property is the destination URL. 02, request JSON data, use <script> make JSONP request. 03, set the internal server proxy to request cross-domain URLs. Returns the data. 04,cors function. The HTTP response header for the target server is "access-control-allow-origin:*". Konjac: But it's not safe. You can set a license for a specific Web site. 05, Multi-window communication, via Targetwindow.postmessage (Date,origin)

• data:
  
• origin: Origin
of the target window

window.addEventListener(‘message‘function(event)false);

Window Add message Event Listener: Event Object

• Event.data is the data sent by PostMessage
  
• Event.origin is the origin of the sending window
  
• Event.source is a window reference for sending messages
  

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"13" JavaScript cross-domain communication