1、当导出Markdown时，如果当前文档没有内容，则将文档标题作为内容

2、修复导入文档时链接处理错误的BUG

models/BookModel.go

@@ -615,9 +615,9 @@ func (book *Book) ImportBook(zipPath string) error {
 
 								filetil.CopyFile(linkPath, dstPath)
 
-								tempLink := strings.TrimPrefix(strings.Replace(dstPath, "\\", "/", -1), strings.Replace(conf.WorkingDirectory, "\\", "/", -1))
+								tempLink := conf.BaseUrl + strings.TrimPrefix(strings.Replace(dstPath, "\\", "/", -1), strings.Replace(conf.WorkingDirectory, "\\", "/", -1))
 
-								link = strings.TrimSuffix(tempLink, originalLink+")") + link + ")"
+								link = strings.TrimSuffix(link, originalLink+")") + tempLink + ")"
 
 							}
 						}

models/book_result.go

@@ -451,12 +451,13 @@ func exportMarkdown(p string, parentId int, bookId int,baseDir string) error {
 		dirPath := filepath.Dir(docPath)
 
 		os.MkdirAll(dirPath, 0766)
-
-
+		markdown := doc.Markdown
+		//如果当前文档不为空
+		if strings.TrimSpace(doc.Markdown) != "" {
 			re := regexp.MustCompile(`!\[(.*?)\]\((.*?)\)`)
 
 			//处理文档中图片
-		markdown := re.ReplaceAllStringFunc(doc.Markdown, func(image string) string {
+			markdown = re.ReplaceAllStringFunc(doc.Markdown, func(image string) string {
 				images := re.FindAllSubmatch([]byte(image), -1)
 				if len(images) <= 0 || len(images[0]) < 3 {
 					return image
@@ -498,6 +499,9 @@ func exportMarkdown(p string, parentId int, bookId int,baseDir string) error {
 				return link
 
 			})
+		}else{
+			markdown = "# " + doc.DocumentName + "\n"
+		}
 		if err := ioutil.WriteFile(docPath, []byte(markdown), 0644); err != nil {
 			beego.Error("导出Markdown失败=>", err)
 			return err