fix: 修复 iOS9 系统 uni.uploadFile 传入 base64 报错的问题

src/platforms/h5/helpers/file.js

@@ -44,8 +44,35 @@ export function base64ToFile (base64) {
   while (n--) {
     array[n] = str.charCodeAt(n)
   }
-  var filename = `${Date.now()}.${type.split('/')[1]}`
-  return new File([array], filename, { type: type })
+  return blobToFile(array, type)
+}
+/**
+ * 简易获取扩展名
+ * @param {string} type
+ * @return {string}
+ */
+function getExtname (type) {
+  const extname = type.split('/')[1]
+  return extname ? `.${extname}` : ''
+}
+/**
+ * blob转File
+ * @param {Blob} blob
+ * @param {string} type
+ * @return {File}
+ */
+export function blobToFile (blob, type) {
+  if (!(blob instanceof File)) {
+    type = type || blob.type || ''
+    const filename = `${Date.now()}${getExtname(type)}`
+    try {
+      blob = new File([blob], filename, { type })
+    } catch (error) {
+      blob = blob instanceof Blob ? blob : new Blob([blob], { type })
+      blob.name = blob.name || filename
+    }
+  }
+  return blob
 }
 /**
  * 从本地file或者blob对象创建url

src/platforms/h5/service/api/network/upload-file.js

-import { urlToFile } from 'uni-platform/helpers/file'
+import {
+  urlToFile,
+  blobToFile
+} from 'uni-platform/helpers/file'
 /**
  * 上传任务
  */
@@ -133,7 +136,7 @@ export function uploadFile ({
   }
 
   Promise
-    .all(files.map(({ file, uri }) => file instanceof Blob ? Promise.resolve(file) : urlToFile(uri)))
+    .all(files.map(({ file, uri }) => file instanceof Blob ? Promise.resolve(blobToFile(file)) : urlToFile(uri)))
     .then(upload)
     .catch(() => {
       setTimeout(() => {