[Bug Report] component: el-drawer Type detection fails when the size property is number

[hlfine]

Element UI version

2.14.1

OS/Browsers version

window

Vue version

2.6.12

Reproduction Link

https://codepen.io/hlfine/pen/rNMJpvV

Steps to reproduce

Click the button

What is Expected?

The property has been changed successfully and can be used normally

What is actually happening?

[Vue warn]: Invalid prop: type check failed for prop "size". Expected String with value "300", got Number with value 300.

found in

---> at packages/drawer/src/main.vue

[wupeiwen]

遇到了同样的问题，将数值300改为字符串"300px"，符合期望成功渲染

[SimoralX]

同遇到，传入number不起作用，只能传入 ‘px’ 或者 ’%‘ 的string类型。

[cs1707]

fixed