nz-image预览图片时是否支持loading自定义？

[bloom8848]

What problem does this feature solve?

如果预览的图片加载比较慢，在用户网速慢的场景下，nz-image是处于“卡死”状态的，有没有一个可以自定义加载状态的属性可以设置？

What does the proposed API look like?

nz-image

[zorro-bot]

Translation of this issue:

Do NZ-IMAGE preview pictures support Loading custom?

What PROBLEM DOES This Feature Solve?

If the previewed picture loading is slow, in the slow user network speed, the NZ-IMAGE is in a "stuck" state. Is there a attribute that can customize the loading state?

What does the proposed api look like?

nz-iMage