自动缩略图插件审核修改

release/UNIVERSAL_SpineThumbnailGenerateServer/js/spine-utils.js

@@ -203,7 +203,7 @@ function splitCompoundName(fileName) {
 	if (!suffix) return null;
 	const name = String(fileName).slice(0, fileName.length - suffix.length);
 	if (!name) return null;
-	return { name, ext: suffix.slice(1) };
+	return { name, ext: String(fileName).slice(-suffix.length + 1) };
 }
 
 /** 从 JSON 文本中读取 spine 版本 */