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並前往https://engineering.fb.com/2012/12/08/developer-tools/under-the-hood-the-javascript-sdk-truly-asynchronous-loading/

Under the Hood: The JavaScript SDK – Truly Asynchronous ...

(function() { var url = 'http://example.org/js.js'; var iframe = document.createElement('iframe'); (iframe.frameElement || iframe) ...

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