优化爬取逻辑-后缀名动态获取，及添加地址兼容判断

src/cmd/start.go

@@ -30,9 +30,16 @@ func start() {
 
 func get(num int) {
 	defer wg.Done()
-	fileName := strconv.Itoa(num) + ".jpg"
-	imgSlice := strings.Split(url, "_")
-	imgUrl := host + imgSlice[0] + "_" + fmt.Sprintf("%02d", num) + ".jpg"
+
+	// 兼容未携带斜杆的地址
+	if url[0] != '/' {
+		url = "/" + url
+	}
+
+	urlSlice := strings.Split(url, "_")                                                // 取URL组装
+	fileSlice := strings.Split(urlSlice[1], ".")                                       // 取后缀名
+	fileName := strconv.Itoa(num) + "." + fileSlice[1]                                 // 组装文件名
+	imgUrl := host + urlSlice[0] + "_" + fmt.Sprintf("%02d", num) + "." + fileSlice[1] // 组装图片URL
 	fmt.Println("获取图片:" + imgUrl)
 
 	resp, err := http.Get(imgUrl)