實現功能：

1.點選播放視訊，後臺視訊點選量增加

2.點贊按鈕，點選為紅色，後臺視訊贊數增加；再次點贊，按鈕變為灰色，後臺視訊贊數不增加

前臺點贊按鈕：

<a href="#" id="zan-{{ v.id }}" name="iconfont zan">
     <i class="iconfont zan"></i>
</a>

            $("#zan-{{ v.id }}").click(function () {
                if (this.name == "iconfont zan") {
                    this.innerHTML = "<i class='iconfont unzan'></i>";
                    this.name = "iconfont unzan";

                    var likes = {{ v.like_num }} +1;
                    var url = "{{ url_for('grade.make_likes', id=project.id) }}";
                    var data_dic = {
                        'like': likes,
                        'video': '{{ v.id }}'
                    };
                    $.ajax({
                        type: 'POST',
                        url: url,
                        data: JSON.stringify(data_dic),
                        contentType: 'application/json; charset=UTF-8',
                        dataType: 'json',
                        success: function (data) {
                            window.history.back();
                        }
                    });

                }
                else {
                    this.innerHTML = "<i class='iconfont zan'></i>";
                    this.name = "iconfont zan";
                    var likess = {{ v.like_num }};
                    var urls = "{{ url_for('grade.make_likes', id=project.id) }}";
                    var data_dics = {
                        'like': likess,
                        'video': '{{ v.id }}'
                    };
                    $.ajax({
                        type: 'POST',
                        url: urls,
                        data: JSON.stringify(data_dics),
                        contentType: 'application/json; charset=UTF-8',
                        dataType: 'json',
                        success: function (data) {
                            window.history.back();
                        }
                    });
                }

            });
 

            var myvideo1 = document.getElementById('myvideo-{{ v.id }}');
            myvideo1.setAttribute("src", '{{ v.path }}');

            myvideo1.addEventListener('play', function () {
                    var views = {{ v.view_num }} +1;
                    var url = "{{ url_for('grade.make_views', id=project.id) }}";
                    var data_dic = {
                        'view': views,
                        'video': '{{ v.id }}'
                    };
                    $.ajax({
                        type: 'POST',
                        url: url,
                        data: JSON.stringify(data_dic),
                        contentType: 'application/json; charset=UTF-8',
                        dataType: 'json',
                        success: function (data) {
                        }
                    });
            });