javascript - How to execute if conditional just once -

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i wondering me how that, because time variable returns default value. it's ibeacon application, don't know if need show more details app. want call function once, can me?

function uint8arrtohexstringnospace(arr) {  	return array.prototype.map.call(arr, function(n) {  		var s = n.tostring(16);  		if(s.length == 1) {  			s = '0'+s;  		}  		return s;  	}).join('');  }    var quit;  function something() {      if(quit) {         window.open("info.html");      }       quit = true;  }        function appendtd(root, value, id) {  	var text = document.createtextnode(value);  	var td = document.createelement("p");  	if(id) {  		td.id = id;  	}  	td.appendchild(text);  	root.appendchild(td);  }    function hex16(i) {  	var s = i.tostring(16);  	while(s.length < 4) {  		s = '0'+s;  	}  	return s;  }        var beacons = {};    var app = {  	  	initialize: function() {  		// important stop scanning when page reloads/closes!  		window.addeventlistener('beforeunload', function(e)  		{  			ibeacon.stopscan();  		});    		this.bindevents();  		  	},  	bindevents: function() {  		document.addeventlistener('deviceready', this.ondeviceready, false);  	},  	ondeviceready: function() {  		//app.receivedevent('deviceready');  		app.startscan();  	},  	receivedevent: function(id) {  		var parentelement = document.getelementbyid(id);  		var listeningelement = parentelement.queryselector('.listening');  		var receivedelement = parentelement.queryselector('.received');    		listeningelement.setattribute('style', 'display:none;');  		receivedelement.setattribute('style', 'display:block;');    		console.log('received event: ' + id);  	},      	  	startscan: function() {  		  		  		ibeacon.startscan({}, function(beacon) {  			//console.log("beacon found: "+beacon.address+" "+beacon.name+" "+beacon.rssi+"/"+beacon.txpower);  			var r = beacon.region;  			//console.log("m"+r.major.tostring(16)+" m"+r.minor.tostring(16)+" uuid "+uint8arrtohexstringnospace(r.uuid));  			var key = 'tx'+beacon.address.replace(/:/g,'_');  			//console.log('key: '+key);  			  			  			  			  			if(beacons[key] == null) {  				beacons[key] = beacon;  				  				  				var root = document.getelementbyid("beaconlistroot");  				var tr = document.createelement("tr");  				var br = document.createelement("br");  				  				// <tr><td>address</td><td>name</td><td>rssi</td><td>id</td><td>uuid</td></tr>  				var adress = '  adress: ';  				var name = '  name: ';  				var distance = '  distance: ';  				var major = '  major: ';  				var minor = 'minor: ';  				var uuid = '  uuid: ';  				  				appendtd(tr, adress + beacon.address + name + beacon.name);  				appendtd(tr, distance + beacon.rssi+" /"+beacon.txpower+"\u00a0"+beacon.estimateddistance.tofixed(2)+'m', key);  				appendtd(tr, major + hex16(r.major)+"\u00a0"+ minor +hex16(r.minor));  				appendtd(tr, uuid + uint8arrtohexstringnospace(r.uuid));  				root.appendchild(tr);  				  				  			} else {  				var td = document.getelementbyid(key);  				td.firstchild.nodevalue = 'power: ' + beacon.rssi+"/"+beacon.txpower+ ' distance: ' + "\u00a0"+beacon.estimateddistance.tofixed(2)+'m';  			  			}  			  			if(beacon.address == '78:a5:04:13:3b:17' && beacon.estimateddistance.tofixed(2) <= 10 ){  				something();  			}  			  			  		}, function(error) {  			console.log("startscan error: " + error);  		});  	},  };

use localstorage: https://developer.mozilla.org/en/docs/web/api/window/localstorage

localstorage (and sessionstorage) let keep persistent values 

function something() {     localstorage.setitem("somethingcalled", "yes");     if(quit) {        window.open("info.html");     }      quit = true; }

then call something():

if (localstorage.getitem("somethingcalled")!="yes") {      something() }

you may whant use sessionstorage instead of localstorage (https://developer.mozilla.org/en-us/docs/web/api/window/sessionstorage)


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