[comp:modal] 期望modal会自动计算z-index, 后出现的弹窗会在前一个弹窗的基础上 z-index + 1

[brenner8023]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

解决弹窗重叠的问题

What does the proposed API look like?

idx的modal会自动计算z-index, 后出现的弹窗会在前一个弹窗的基础上 z-index 1

[idux-bot]

Translation of this issue:

[Comp: MODAL] It is expected that MODAL will automatically calculate Z-Index, and the pop-up window that appears will appear on the basis of the previous pop-up window z-index + 1

• I have searched the [issues] (https://github.com/iduxfe/idux/isSues) of this repository that this is not a duplicate.

What PROBLEM DOES This Feature Solve?

Solve the problem of resolving the pop -up window

What does the proposed api look like?

The MODAL of IDX will automatically calculate the Z-Index, and the pop-up window that appears after the previous pop-up window will be on the basis of the previous pop-up window Z-Index 1