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Методы и свойства XHR
• open(method, url, isNotBlock)
– method – 'get', 'post', …
– url – 'http://pewpew.com', '/file.jpg', 'file.jpg', '//site.ru:8080/'
• send(body)
– body – post тело 'name=name&time=1345678&message=hello'
• readyState: Number
• responseText: String
• status: Number
– HTTP статус ответа – 200, 404, 500
• addEventListener(event, function)
• ...
https://developer.mozilla.org/en-US/docs/DOM/
XMLHttpRequest