feat: 课后资料支持多个文件

src/modules/viewer/components/read/chapterRead.vue

-
 <template>
   <container :title="chapter.name">
     <file-list :files="files"></file-list>
@@ -32,12 +31,7 @@ export default {
   },
   computed: {
     files() {
-      const reading = this.chapter.reading
-      const file = {
-        file_name: reading.reading_content,
-        file_url: reading.reading_attachment
-      }
-      return [file]
+      return this.chapter.reading.reading_attachment || []
     }
   }
 }

src/modules/viewer/components/read/fileList.vue

 <template>
   <div>
-    <ul class="file-list" v-if="files.length">
-      <li class="file-list-item" v-for="file in files" :key="file.id">
+    <ul class="file-list" v-if="currentFiles.length">
+      <li class="file-list-item" v-for="file in currentFiles" :key="file.id">
         <a :href="file.file_url" target="_blank">
           <i class="el-icon-document"></i>
           <div class="file-list-item__inner" v-html="file.file_name"></div>
@@ -33,6 +33,14 @@ export default {
     },
     // 文件列表
     files: { type: Array, default: () => [] }
+  },
+  computed: {
+    currentFiles() {
+      return this.files.map(file => {
+        file.file_url = file.file_url || file.url
+        return file
+      })
+    }
   }
 }
 </script>