问题
In a Chrome Extension, I'm trying to get gmail compose body content.
An error jumps out sporadically, and does not prevents it from working.
This is being run as a content script. I believe permissions are not the issue here, because when there is a permission missing, the error is different and the operation is blocked by Chrome, definitely not the case.
Error comes out in this line:
encodeURIComponent($canvas.find('iframe').contents().find('body').text());
where
var $canvas = $('#canvas_frame').contents();
Any information on this error and a possible turnaround?
回答1:
You can not read cross site content using javascript. XSS Auditor of Google Chorme will never allow this.
Please have a look at http://en.wikipedia.org/wiki/Same_origin_policy
UPDATE 1 -
There is support for cross site communication using window.postMessage() in Chrome 2+. Please have a look at this documentation https://developer.mozilla.org/en-US/docs/DOM/window.postMessage
回答2:
To give a good answer, we need more information:
- where exactly you are running this code, is it in the web page, the extension's content script or the etension's background script?
- Also, what does your manifest.json file look like? Which sites have you asked for permission to run on.
I suspect this is a case of a badly-written error message and really it is saying: your extension does not have permission to run on apis.google.com. In that case, simply add permissions for apis.google.com. More details are in the Chrome extensions docs: http://developer.chrome.com/extensions/manifest.html#permissions
来源：https://stackoverflow.com/questions/11852899/inter-frame-sop-chrome-extension