[modal] modal use :style="some string not object" will cause error

[candy-Tong]

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

Version

undefined

Environment

windows10,google chrome 79.0.3945.130,vue 2.6.10

Reproduction link

Steps to reproduce

1. 点击按钮就会报错

Failed to set an indexed property on 'CSSStyleDeclaration': Indexed property setter is not supported.

What is expected?

1. 能打开弹窗

What is actually happening?

不能打开弹窗

是由这个句引起的

vue :style 支持传入字符串，这时候 $attrs.style 拿到的也是字符串，如果 extend 字符串就会出现问题

[github-actions]

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