feat(Grid): column-num can be string

src/grid/README.md

@@ -102,13 +102,13 @@ Vue.use(GridItem);
 
 | Attribute | Description | Type | Default |
 |------|------|------|------|
-| column-num `v2.0.4` | Column Num | *number* | `4` |
+| column-num `v2.0.4` | Column Num | *number \| string* | `4` |
+| icon-size `v2.2.6` | Icon size | *number \| string* | `28px` |
 | gutter | Gutter | *number \| string* | `0` |
 | border | Whether to show border | *boolean* | `true` |
 | center | Whether to center content | *boolean* | `true` |
 | square | Whether to be square shape | *boolean* | `false` |
 | clickable | Whether to show click feedback when clicked | *boolean* | `false` |
-| icon-size `v2.2.6` | Icon size | *number \| string* | `28px` |
 
 ### GridItem Props
 

src/grid/README.zh-CN.md

@@ -120,13 +120,13 @@ Vue.use(GridItem);
 
 | 参数 | 说明 | 类型 | 默认值 |
 |------|------|------|------|
-| column-num `v2.0.4` | 列数 | *number* | `4` |
+| column-num `v2.0.4` | 列数 | *number \| string* | `4` |
+| icon-size `v2.2.6` | 图标大小，默认单位为`px` | *number \| string* | `28px` |
 | gutter | 格子之间的间距，默认单位为`px` | *number \| string* | `0` |
 | border | 是否显示边框 | *boolean* | `true` |
 | center | 是否将格子内容居中显示 | *boolean* | `true` |
 | square | 是否将格子固定为正方形 | *boolean* | `false` |
 | clickable | 是否开启格子点击反馈 | *boolean* | `false` |
-| icon-size `v2.2.6` | 图标大小，默认单位为`px` | *number \| string* | `28px` |
 
 ### GridItem Props
 

src/grid/index.js

@@ -13,7 +13,7 @@ export default createComponent({
     iconSize: [Number, String],
     clickable: Boolean,
     columnNum: {
-      type: Number,
+      type: [Number, String],
       default: 4,
     },
     center: {