javascript - video标签在移动端不显示预览图

Question

video标签在iPhone Safari和小米Chrome上都没有预览图，为什么？

 <video *ngIf="photo.uploaded_photos[0].photo.indexOf('mp4')!= -1"
       class="responsive-video" controls>
       <source src='http://7xj2zq.com5.z0.glb.qiniucdn.com/uploads/photos/049356f2-a37d-4231-9366-a8d7e29ea58b/17:36:01.68142747304.mp4'
                                                    type="video/mp4">
                                        </video>

发现问题了，加poster，没仔细看文档

Answer 1

发现问题了，加poster，没仔细看文档