[Cordova] Cordova network check

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 출처: http://pineoc.blogspot.kr/2016/01/cordova-network-check.html

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plugin GitHub Link : https://github.com/apache/cordova-plugin-network-information

- installation

$cordova plugin add cordova-plugin-network-information

	document.addEventListener("deviceready", checkConnection, false);
	function checkConnection() {
	function check(){
	var networkState = navigator.connection.type;
	var states = {};
	states[Connection.UNKNOWN] = 'Unknown connection';
	states[Connection.ETHERNET] = 'Ethernet connection';
	states[Connection.WIFI] = 'WiFi connection';
	states[Connection.CELL_2G] = 'Cell 2G connection';
	states[Connection.CELL_3G] = 'Cell 3G connection';
	states[Connection.CELL_4G] = 'Cell 4G connection';
	states[Connection.CELL] = 'Cell generic connection';
	states[Connection.NONE] = 'No network connection';
	alert('Connection type: ' + states[networkState]);
	}
	check();
	}

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