fix: 特征作业样式修改；图片预览显示问题

src/_tezhongzuoye.css

 html,
 body {
   letter-spacing: 0.01rem;
+  background-color: #f5f6fa;
 }
 
 .wrapper {

src/_tezhongzuoye_detail.js

@@ -227,12 +227,12 @@ window.addEventListener("load", function() {
 			},
 
 			showImage(list, index) {
-				const attachmentFile = list.map((item) => {
+				const images = list.map((item) => {
 					return this.previewUrl + item
 				})
-				console.log(attachmentFile, 'attachmentFile')
+				
 				vant.ImagePreview({
-					attachmentFile,
+					images,
 					startPosition: index,
 					closeable: true,
 				});