get nearest location based on latitude and longitude javascript

1function distance(lat1, lon1, lat2, lon2, unit) {
2    	var radlat1 = Math.PI * lat1/180
3    	var radlat2 = Math.PI * lat2/180
4    	var theta = lon1-lon2
5    	var radtheta = Math.PI * theta/180
6    	var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
7    	if (dist > 1) {
8    		dist = 1;
9    	}
10    	dist = Math.acos(dist)
11    	dist = dist * 180/Math.PI
12    	dist = dist * 60 * 1.1515
13    	if (unit=="K") { dist = dist * 1.609344 }
14    	if (unit=="N") { dist = dist * 0.8684 }
15    	return dist
16    }
17
18    var data = [{
19        "code": "0001",
20        "lat": "1.28210155945393",
21        "lng": "103.81722480263163",
22        "location": "Stop 1"
23    }, {
24        "code": "0003",
25        "lat": "1.2777380589964",
26        "lng": "103.83749709165197",
27        "location": "Stop 2"
28    }, {
29        "code": "0002",
30        "lat": "1.27832046633393",
31        "lng": "103.83762574759974",
32        "location": "Stop 3"
33    }];
34
35    var html = "";
36    var poslat = 1.28210155945393;
37    var poslng = 103.81722480263163;
38
39    for (var i = 0; i < data.length; i++) {
40        // if this location is within 0.1KM of the user, add it to the list
41        if (distance(poslat, poslng, data[i].lat, data[i].lng, "K") <= 0.1) {
42            html += '<p>' + data[i].location + ' - ' + data[i].code + '</p>';
43        }
44    }
45
46    $('#nearbystops').append(html);