[new feature] Card: 卡片组件增加图片懒加载属性 (#707)

packages/card/README.md

@@ -56,6 +56,7 @@
 | currency | 货币符号 |  `String` | `¥` |
 | thumb-link | 点击左侧图片后的跳转链接 | `String` | - |
 | link-type | 链接跳转类型，可选值为 `redirectTo` `switchTab` `reLaunch` | `String` | `navigateTo` |
+| lazy-load | 是否开启图片懒加载 | `String` | `false` |
 
 ### Slot
 

packages/card/index.ts

@@ -17,6 +17,7 @@ VantComponent({
     title: String,
     price: String,
     centered: Boolean,
+    lazyLoad: Boolean,
     thumbLink: String,
     linkType: {
       type: String,

packages/card/index.wxml

@@ -1,6 +1,6 @@
 <view class="custom-class van-card {{ centered ? 'van-card--center' : '' }}">
   <view class="van-card__thumb" bind:tap="onClickThumb">
-    <image wx:if="{{ thumb }}" src="{{ thumb }}" class="van-card__img thumb-class" />
+    <image wx:if="{{ thumb }}" lazy-load="{{ lazyLoad }}" src="{{ thumb }}" class="van-card__img thumb-class" />
     <slot wx:else name="thumb" />
     <van-tag
       wx:if="{{ tag }}"