pref:复制原开发者base64转file

@@ -20,9 +20,9 @@ export const readFile = (file: File) => {
 
 /**
  * * 通过 a 标签下载数据
- * @param url 
- * @param filename 
- * @param fileSuffix 
+ * @param url
+ * @param filename
+ * @param fileSuffix
  */
 export const downloadByA = (url: string, filename = new Date().getTime(), fileSuffix?: string) => {
   const ele = document.createElement('a') // 创建下载链接
@@ -43,12 +43,26 @@ export const downloadByA = (url: string, filename = new Date().getTime(), fileSu
  * @param { ?string } filename 文件名称（默认随机字符）
  * @param { ?string } fileSuffix 文件名称（默认随机字符）
  */
-export const downloadTextFile = (
-  content: string,
-  filename = new Date().getTime(),
-  fileSuffix?: string
-) => {
+export const downloadTextFile = (content: string, filename = new Date().getTime(), fileSuffix?: string) => {
   // 字符内容转变成blob地址
   const blob = new Blob([content])
   downloadByA(URL.createObjectURL(blob), filename, fileSuffix)
 }
+// THINGS_KIT
+/**
+ * * base64转file
+ * @param dataurl
+ * @param fileName
+ * @returns
+ */
+export const base64toFile = (dataurl: string, fileName: string) => {
+  let dataArr = dataurl.split(','),
+    mime = (dataArr as any[])[0].match(/:(.*?);/)[1],
+    bstr = atob(dataArr[1]),
+    n = bstr.length,
+    u8arr = new Uint8Array(n)
+  while (n--) {
+    u8arr[n] = bstr.charCodeAt(n)
+  }
+  return new File([u8arr], fileName, { type: mime })
+}