https://volyn.com.ua/src/js/views-tracker.js?v=2.1

1var Article, isLocalStorageSupported;
2
3isLocalStorageSupported = function() {
4    try {
5        if (window['localStorage'] != null) return true;
6    } catch (error) {
7        return false;
8    }
9};
10
11Article = (function() {
12
13    Article.prototype.id = null;
14
15    Article.prototype.lastView = null;
16
17    Article.prototype.nowTimestamp = null;
18
19    Article.prototype.allViewed = {};
20
21    Article.prototype.UUID = '';
22
23    function Article() {
24        this.id = $('#post-view').data('id');
25        if ((this.id != null) && isLocalStorageSupported()) {
26            this.loadViewsHistory();
27            this.getTImestamp();
28            this.getCode();
29            this.updateData();
30        }
31    }
32
33    Article.prototype.loadViewsHistory = function() {
34        var data;
35        if (!(this.viewsHistoryLoaded != null) && isLocalStorageSupported()) {
36            data = localStorage.getItem('news.viewed');
37            this.allViewed = data ? JSON.parse(data) : {};
38            if (this.id != null) this.lastView = this.allViewed[this.id];
39            return this.viewsHistoryLoaded = true;
40        }
41    };
42
43    Article.prototype.getTImestamp = function() {
44        return this.nowTimestamp = Math.round((new Date()).getTime() / 1000);
45    };
46
47    Article.prototype.getCode = function() {
48        if ((this.id != null) && isLocalStorageSupported()) {
49            this.UUID = localStorage.getItem('my.UUID');
50            if (!(this.UUID != null)) {
51                this.UUID = $("#gCode").val();
52                if (this.UUID != null) localStorage.setItem('my.UUID', this.UUID);
53            }
54        }
55        return this.UUID;
56    };
57
58    Article.prototype.updateData = function() {
59        if ((this.id != null) && isLocalStorageSupported()) {
60
61            if (typeof this.allViewed[this.id] === 'undefined') {
62                var url = $('#post-view').data('tracking-url');
63                $.ajax({
64                    url: url,
65                    type: 'POST',
66                    dataType: 'json',
67                    data: {
68                        id: this.id
69                    },
70
71                    success: function (data) {
72                        //
73                    },
74
75                    error: function (data) {
76                        //
77                    }
78                });
79            }
80            this.allViewed[this.id] = this.getTImestamp();
81            return localStorage.setItem('news.viewed', JSON.stringify(this.allViewed));
82        }
83    };
84
85    return Article;
86
87})();
88
89if ($("#post-view").length) {

90    new Article();
91}