tree-select绑定的是key值，而不是value值

[yjq635]

Reproduction link

https://stackblitz.com/edit/angular-oudzoz?file=src%2Fapp%2Fapp.component.ts

Steps to reproduce

树形选项选中节点，页面显示绑定值

What is expected?

显示node的value值

What is actually happening?

显示node的key值

Environment	Info
ng-zorro-antd	18.1.1
Browser	chrome

[zorro-bot]

Translation of this issue:

TREE-SELECT is bound to the key value, not the value value

REPRODUCTION LINK

[https://stackblitz.com/edit/angular- means-organdzoz?file=src%2FApp.com p%2FAPP. Component.ts)

STEPS To Reproduce

Tree options Select the node, page display binding value

What is exfected?

Display the value value of Node

What is actually happy?

Show the key value of node

| ENVIRONMENT | Info |
| --- | --- | |
| NG-Zorro-ATD | 18.1.1 |
| Browser | Chrome |

[yjq635]

取key字段值的问题是 nzExpandedKeys的类型是string[],从而导致key的值只能是string类型，
目前我给key绑定实际值(number类型) 且nzExpandedKeys 设置为nuber[] 也可以，只是模板有类型错误提示