diff --git a/utils/index.js b/utils/index.js
index bfc6421..22dcee6 100644
--- a/utils/index.js
+++ b/utils/index.js
@@ -64,9 +64,10 @@ export function image2Base642(file) {
 /**
  base64转File对象
  */
-export function base642File(base64, filename = "file") {
+export function base642File(base64, filename = 'file') {
   const arr = base64.split(",");
   const mime = arr[0].match(/:(.*?);/)[1];
+  const ext = mime.split('/')[1];
   const bstr = atob(arr[1]);
   let n = bstr.length;
   const u8arr = new Uint8Array(n);
@@ -75,7 +76,7 @@ export function base642File(base64, filename = "file") {
     u8arr[n] = bstr.charCodeAt(n);
   }
 
-  return new File([u8arr], filename, { type: mime });
+  return new File([u8arr], `${filename}.${ext}`, { type: mime });
 }
 
 /**