Batch collapse and expand menus by function method

[jahnli]

This function solves the problem (这个功能解决的问题)

Batch collapse and expand menus by function method

Expected API (期望的 API)

Batch collapse and expand menus by function method

[07akioni]

@Talljack use watcheffect to initilize the uncontrolledExpandedKeys

[jahnli]

@07akioni Are you considering similar control functions like iView and Ant

[Talljack]

@Talljack use watcheffect to initilize the uncontrolledExpandedKeys

OK

[07akioni]

@07akioni Are you considering similar control functions like iView and Ant

No, if you reset default-value to [], the collapsed state would be reset.

However, why don't you just using v-model:expandedKeys and reset the expandedKeys?

[07akioni]

@Talljack 我想了一下这么做有点问题就是如果用户写了 <n-menu :default-expanded-keys="[]" /> 的话每次重新渲染都会触发 watchEffect，这样也有点小问题，所以在 watchEffect 要检查两次的数组是不是包含的值没变化。

[07akioni]

新增了一个 watch-props 的属性解决了

[jahnli]

@07akioni Is it possible to provide demo in the document for everyone's reference