Chrome扩展程序OSChina-Notifier

(function() {
	'use strict';

	var xhr = function() {
		var xhr = new XMLHttpRequest();
		return function( method, url, callback ) {
			xhr.onreadystatechange = function() {
				if ( xhr.readyState === 4 ) {
					callback( xhr.responseText );
				}
			};
			xhr.open( method, url );
			xhr.send();
		};
	}();

	window.OSChinaNotifCount = function( callback ) {

		var NOTIFICATIONS_URL = 'http://www.oschina.net/';
		xhr( 'GET', NOTIFICATIONS_URL, function( data ) {
			if(data != ""){
				var index = data.indexOf("total_count");
				callback( index == -1 ? "" : data.substring(index+12,index+13));
			}else{
				callback(false);
			}
		});

	};

})();

(function() {
	'use strict';

	function render( badge, color, title ) {
		chrome.browserAction.setBadgeText({
			text: badge
		});
		chrome.browserAction.setBadgeBackgroundColor({
			color: color
		});
		chrome.browserAction.setTitle({
			title: title
		});
	}

	function update() {
		OSChinaNotifCount(function( count ) {
			if(count !== false){
				render( count, [65, 131, 196, 255], 'OSChina Notifier' );
			}else{
				render( ':(', [166, 41, 41, 255], 'You have to be connected to the internet and logged into OSChina' );
			}
		});
	}

	var UPDATE_INTERVAL = 1000 * 60;

	setInterval( update, UPDATE_INTERVAL );

	chrome.browserAction.onClicked.addListener(function() {
		window.open('http://www.oschina.net/');
	});

	update();

})();