js判断当前是流量还是wifi

<script type="text/javascript">

var connection = navigator.connection||navigator.mozConnection||navigator.webkitConnection||{tyep:'unknown'};

var type_text = ['unknown','ethernet','wifi','2g','3g','4g','none
'];

alert(connection.type);

var re_el = document.getElementById("re");

var btn_el = document.getElementById("btn");

function get_status(){

if(typeof(connection.type) == "number"){

connection.type_text = type_text[connection.type];

}else{

connection.type_text = connection.type;

}

if(typeof(connection.bandwidth) == "number"){

if(connection.bandwidth > 10){

connection.type = 'wifi';

}else if(connection.bandwidth > 2){

connection.type = '3g';

}else if(connection.bandwidth > 0){

connection.type = '2g';

}else if(connection.bandwidth == 0){

connection.type = 'none';

}else{

connection.type = 'unknown';

}

}

var html = 'Type : '+connection.type_text;

html += 'Bandwidth : '+connection.bandwidth;

html += 'isOnline : '+navigator.onLine;

re_el.innerHTML = html;

}

btn_el.onclick = function(){

re_el.innerHTML = 'Waiting...';

get_status();

}

</script>