The width of Affix in component Affix & Anchor

[Sampwood]

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

What problem does this feature solve?

既然组件不支持随容器宽度变化自动变化，能不能不要在style中写入width，或者通过props能手动去修改这个width

What does the proposed API look like?

Affix & Anchor中Affix 支持 手动设置width而不去自动计算。例如可以设置成width:100%，然后就可以自动适配父容器宽度。

[tangjinzhou]

没懂说的哪个组件

[github-actions]

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