notification 带icon时，methods不同的定义出现问题

[caiyl1314]

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

Version

1.7.2

Environment

vue：2.5.17，win10，chrome：86.0.4240.75(64 位)

Reproduction link

Steps to reproduce

分别点击“Open the notification box1”和“Open the notification box2”

What is expected?

效果一致，先alert出对应按钮，然后弹出带图标的通知

What is actually happening?

1、按钮1，先alert出对应按钮，然后弹出带图标的通知
2、按钮2，先alert出对应按钮，然后console报错index.js:27 ReferenceError: h is not defined （如果notification 的config中不包含icon属性则能正常显示）

[tangjinzhou]

https://codesandbox.io/s/vue-antd-template-forked-7vd80?file=/src/App.vue

use h=>

[github-actions]

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