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src/utils/file.js

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+export function get_suffix(filename) {
+  var pos = filename.lastIndexOf('.')
+  var suffix = ''
+  if (pos !== -1) {
+    suffix = filename.substring(pos)
+  }
+  return suffix
+}
+
+export function random_string(len) {
+  len = len || 32
+  var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
+  var maxPos = chars.length
+  var pwd = ''
+  for (let i = 0; i < len; i++) {
+    pwd += chars.charAt(Math.floor(Math.random() * maxPos))
+  }
+  return pwd
+}
+
+export function random_filename(filename) {
+  var suffix = get_suffix(filename)
+  var time = new Date()
+  var time2 = new Date('2020/01/01')
+  return Math.ceil((time.getTime() - time2.getTime()) / 1000) + '_' + random_string(10) + suffix
+}
+
+export function utf8_to_b64(str) {
+  return window.btoa(unescape(encodeURIComponent(str)))
+}
+
+export function b64_to_utf8(str) {
+  return decodeURIComponent(escape(window.atob(str)))
+}