feat(GridItem): add icon-prefix prop (#4276)

* Update index.ts

* Update index.wxml

* Update index.ts

* docs(GridItem): add icon-prefix

* Update README.md

packages/grid-item/index.ts

@@ -12,6 +12,7 @@ VantComponent({
   props: {
     icon: String,
     iconColor: String,
+    iconPrefix: String,
     dot: Boolean,
     info: null,
     badge: null,

packages/grid-item/index.wxml

@@ -15,7 +15,7 @@
     </block>
     <block wx:else>
       <view class="van-grid-item__icon icon-class">
-        <van-icon wx:if="{{ icon }}" name="{{ icon }}" color="{{ iconColor }}" dot="{{ dot }}" info="{{ badge || info }}" size="{{ iconSize }}" />
+        <van-icon wx:if="{{ icon }}" name="{{ icon }}" color="{{ iconColor }}" class-prefix="{{ iconPrefix }}" dot="{{ dot }}" info="{{ badge || info }}" size="{{ iconSize }}" />
         <slot wx:else name="icon"></slot>
       </view>
       <view class="van-grid-item__text text-class">

packages/grid/README.md

@@ -150,6 +150,7 @@
 | text | 文字 | _string_ | - | - |
 | icon | 图标名称或图片链接，可选值见 [Icon 组件](#/icon) | _string_ | - | - |
 | icon-color | 图标颜色 | _string_ | - | - |
+| icon-prefix `v1.7.0` | 第三方图标前缀 | _string_ | `van-icon` | - |
 | dot | 是否显示图标右上角小红点 | _boolean_ | `false` | - |
 | badge | 图标右上角徽标的内容 | _string \| number_ | - | - |
 | url | 点击后跳转的链接地址 | _string_ | - | - |