nzModal 弹出框设置 nzZIndex 属性, 遮罩层未紧跟弹出框下

[SuperRichZhao]

Reproduction link

https://stackblitz.com/edit/angular-vqhcrl?file=src/app/app.component.ts

Steps to reproduce

1. 点击 open first modal 按钮 打开第一个弹出框
2. 在打开弹出框的里点击 open second modal 按钮, 打开第二个弹出框, 第二个弹出框的遮罩层不在第一个弹出框的上面

What is expected?

遮罩层可跟随弹出框一起出现, 并在弹出框下一层

What is actually happening?

遮罩层的 z-index 仍然是 1000

Environment	Info
ng-zorro-antd	11.0.0
Browser	chrome 89.0

[zorro-bot]

Translation of this issue:

NZMODAL pop-up box sets the NZZIndex property, the mask layer is not followed by the pop-up

reproduction link

[https://stackblitz.com/edit/angular-vqhcrl?file=src/app/app.component.ts](https://stackblitz.com/edit/angular-vqhcrl?file=src/app/App. Component.ts)

steps to reproduce

1. Click the Open First Modal button to open the first pop-up box.
2. Click the Open Second Modal button in the open pop-up box, open the second pop-up box, the mask layer of the second pop-up box is not on the first pop-up box

What is expected?

The mask layer can appear together with the pop-up box and next layer below the pop-up

What is actually happens?

The Z-Index of the mask layer is still 1000

ENVIRONMENT	INFO
Ng-Zorro-ANTD	11.0.0
Browser	Chrome 89.0