画板预览页面改为保存

src/views/book/courseware/preview/components/drawing/DrawingPreview.vue

@@ -57,7 +57,7 @@
         <img :src="penIndex == 0 ? thinpenActive : thinpen" class="pen-img" @click="selSize(0)" />
         <img :src="penIndex == 1 ? thickpenActive : thickpen" class="pen-img" @click="selSize(1)" />
         <img :src="penIndex == 2 ? thicskpenActive : thicskpen" class="pen-img" @click="selSize(2)" />
-        <div class="save" @click="save">Save</div>
+        <div class="save" @click="save">保 存</div>
       </div>
     </div>
   </div>