修复导出图 渲染

src/views/Editor/Canvas/index.vue

@@ -94,7 +94,8 @@
       <LinkDialog @close="linkDialogVisible = false" />
     </Modal>
   </div>
-  <div style="opacity: 0;position: absolute;left: 100px;top: 0;" v-if="!model&&ConfigId&&slides.length>0">
+  <div style="opacity: 0;position: absolute;left: 100px;top: 0;bottom: 0;overflow: auto;z-index: 9999;" 
+  v-if="!model&&ConfigId&&slides.length>0">
     <div class="export-img-dialog">
       <div class="thumbnails-view">
         <div class="thumbnails" v-for="slide in slides" ref="FeatureImgRef">

src/views/Editor/Toolbar/ElementTemplateData.vue

@@ -128,7 +128,8 @@
     </div>
 
     <!-- 生成封面图 -->
-    <div style="opacity: 0;position: absolute;left: 100px;" v-if="isCoverImg">
+    <div style="opacity: 0;position: absolute;left: 100px;top: 0;bottom: 0;" 
+    v-if="isCoverImg">
         <div class="export-img-dialog">
           <div class="thumbnails-view">
             <div class="thumbnails" ref="FeatureImgRef">