带或不带jquery的Angular 2+中的Bootstrap 3日期选择器

AngularJS2。我使用了[解决方案]: How to use Bootstrap 3 Datepicker in angular 2 . 但出现了这样的错误

Cannot find name '$'

我的代码如下。

 <script src="//code.jquery.com/jquery-1.12.0.min.js"></script>
 <script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
 <script
 src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"
 integrity="sha256-T0Vest3yCU7pafRw9r+settMBX6JkKN06dqBnpQ8d30="
 crossorigin="anonymous"></script>
 <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js">   </script>

新工作。组成部分html

<div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
   <input type='text' class="form-control" id='proposed_start_at' formControlName="proposed_start_at" #proposed_start_at/>
   <label class="mdl-textfield__label" for="proposed_start_at">Start Time</label>
</div>

@ViewChild("proposed_start_at")
public startDateElementRef: ElementRef;

ngAfterViewInit() {
    $(this.startDateElementRef.nativeElement).datetimepicker({format: 'LT'});
}

https://eonasdan.github.io/bootstrap-datetimepicker/