优化电子签名图片格式

src/views/yinnong/signature.vue

@@ -117,21 +117,20 @@ export default {
         
         });
     },
-    dataURLtoBlob(dataurl) {
-      var arr = dataurl.split(',');
-        //注意base64的最后面中括号和引号是不转译的   
-        var _arr = arr[1].substring(0,arr[1].length-2);
-        var mime = arr[0].match(/:(.*?);/)[1],
-          bstr =atob(_arr),
-          n = bstr.length,
-          u8arr = new Uint8Array(n);
+    dataURLtoBlob (dataurl, filename = 'file') {
+        let arr = dataurl.split(',')
+        let mime = arr[0].match(/:(.*?);/)[1]
+        let suffix = mime.split('/')[1]
+        let bstr = atob(arr[1])
+        let n = bstr.length
+        let u8arr = new Uint8Array(n)
         while (n--) {
-          u8arr[n] = bstr.charCodeAt(n);
+            u8arr[n] = bstr.charCodeAt(n)
         }
-        return new Blob([u8arr], {
-          type: mime
-        });
-    },
+        return new File([u8arr], `${filename}.${suffix}`, {
+            type: mime
+        })
+      },
   }
 }