JS Wifi Connection Type Detection SRC

<script>
navigator.connection.addEventListener('change',function(){
var type = navigator.connection.type;
if(type=='wifi'){
document.writeln(type+' <br>');
}
if(type=='disconnected'){
document.writeln(type+' <br>');
}
if(type=='none'){
document.writeln(type+' <br>');
}
if(type=='bluetooth'){
document.writeln(type+' <br>');
}
if(type=='wiimax'){
document.writeln(type+' <br>');
}
if(type=='ethernet'){
document.writeln(type+' <br>');
}
if(type=='mixed'){
document.writeln(type+' <br>');
}
if(type=='unknown'){
document.writeln(type+' <br>');
}
if(type=='other'){
document.writeln(type+' <br>');
}
});
</script>