javascript - How to set global variable in query.on() - 


var loadlatitude = "";   query.on("child_added", function(messagesnapshot){   var messagedata = messagesnapshot.val();  // gets key particular entry   var key = messagesnapshot.getkey();    // create object   var obj = {key:key,              url:messagedata.url,              longitude:messagedata.longitude,              latitude:messagedata.latitude,              filename:messagedata.filename};              arr.push(obj);  loadlatitude = messagedata.latitude;    s = s+ "<p align='center'><img src='" + messagedata.url + "' style=' border-style:solid;  border-width:5px;  border-radius:5px; margin-left: auto; margin-right: auto; width: 300px; height:300px;'/>"+messagedata.filename+messagedata.latitude+messagedata.longitude+"</p>";    $("#photolist").html(s); });

i retreive latitude , longitude firebase database. however, unable save global variable.


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