var supportNet=(typeof(navigator.onLine)=='boolean');
var supportCheck=navigator.network&&navigator.network.connection;
if(!supportNet){
	document.getElementById('connectbar').innerHTML='什么破烂浏览器，不支持HTML5';
}
if(typeof(supportCheck)=='undefined'){
	document.getElementById('statusbar').innerHTML='啊哎！你的系统或浏览器不支持。嘻嘻。';
}
function checkNet(){
	if(supportNet){
		document.getElementById('connect').innerHTML=navigator.onLine?'在线 online':'离线 offline';
	}	
	if(supportCheck){
	    var networkState = navigator.network.connection.type;
	    var states = {};
	    states[Connection.UNKNOWN]  = '未知网络';
	    states[Connection.ETHERNET] = '网线';
	    states[Connection.WIFI]     = 'WIFI网络';
	    states[Connection.CELL_2G]  = '2G网络';
	    states[Connection.CELL_3G]  = '3G网络';
	    states[Connection.CELL_4G]  = '4G网络';
	    states[Connection.NONE]     = '没有网络';
		document.getElementById('status').innerHTML=states[networkState];
	}
}
window.setInterval(checkNet,500);