fix image scale

@@ -24,23 +24,24 @@ export default {
       };
     },
     itemSize() {
-      const {height: fHeight} = this.thumbSize;
+      const {width: fWidth, height: fHeight} = this.thumbSize;
+      const fScale = fWidth / fHeight;
       const scale = this.data.width / this.data.height;
 
-      if (scale > 1) {
+      if (scale > fScale) {
         return {
-          width: 750 / 40,
-          height: 750 / 40 / scale
+          width: fWidth,
+          height: fWidth / scale
         };
-      } else if (scale < 1) {
+      } else if (scale < fScale) {
         return {
           width: fHeight * scale,
           height: fHeight
         };
       } else {
         return {
-          width: 750 / 40,
-          height: 750 / 40
+          width: fWidth,
+          height: fHeight
         };
       }
     }

@@ -4,7 +4,7 @@
       <ArticleItemSlideImage v-if="data.blockList.length === 1" :lazy="false" :data="data.blockList[0]" :thumb-size="firstBlockSize"></ArticleItemSlideImage>
       <Slide :key="`slide${data.articleId}`" v-else ref="slide" :data="data.blockList" :refresh-reset-current="false" :initial-index="slideIndex - 1" :threshold="0.2" :auto-play="false" :loop="false" :options="scrollOption" @change="onChange">
         <SlideItem class="slide-item" :style="slideItemStyle" v-for="(item, inx) in data.blockList" :key="inx">
-          <ArticleItemSlideImage v-if="!thumb || inx === 0" :lazy="lazy && inx > 0" :data="item" :thumb-size="firstBlockSize"></ArticleItemSlideImage>
+          <ArticleItemSlideImage v-if="!thumb || inx === 0" :lazy="lazy || inx > 0" :data="item" :thumb-size="firstBlockSize"></ArticleItemSlideImage>
         </SlideItem>
         <template slot="dots" slot-scope="props">
           <span class="slide-dot"