HTML

 <form id="form" class="p-2">

                    <div class="form-group">
                        <label for="tagSelector">选择一个标签</label>
                        <select class="form-control" id="tagSelector">
                        </select>
                    </div>
                    <div class="form-group">
                        <label for="startDate">开始日期</label>
                        <input id="startDate" type="date" required>

                    </div>
                    <div class="form-group">
                        <label for="endDate">结束日期</label>
                        <input id="endDate" type="date" required>

                    </div>
                    <div class="form-group">
                        <label for="startTime">开始时间</label>
                        <input id="startTime" type="time">

                    </div>
                    <div class="form-group">
                        <label for="endTime">结束时间</label>
                        <input id="endTime" type="time">

                    </div>
                    <div class="form-group">
                        <label for="count">计数</label>
                        <input id="count" type="number" min="1">

                    </div>
                    <div class="form-group">
                        <label for="interval">间隔 (秒)</label>
                        <input id="interval" type="number" min="1">

                    </div>

                    <input type="submit" value="PLOT CHART" id="plotButton" class="btn btn-block mt-2 my-2">

                    <span id="warning" class="alert alert-danger" style="display: none">Please fill in all the fields!</span>

                </form>