点击图片弹出input type=file选择器

<label for="UploadCoverPhoto" class="cursor-pointer">
　　<img class="dib max-w100pct h-auto" src="img/VeriDetailImg1.png">
</label>
<input type="file" id="UploadCoverPhoto" class="dn" />

如题，懒了，不想多写！