fix bugs & add batchdelete peer & add peer to ab

src/utils/file.js

@@ -1,4 +1,4 @@
-export function get_suffix(filename) {
+export function get_suffix (filename) {
   var pos = filename.lastIndexOf('.')
   var suffix = ''
   if (pos !== -1) {
@@ -7,7 +7,7 @@ export function get_suffix(filename) {
   return suffix
 }
 
-export function random_string(len) {
+export function random_string (len) {
   len = len || 32
   var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'
   var maxPos = chars.length
@@ -18,17 +18,40 @@ export function random_string(len) {
   return pwd
 }
 
-export function random_filename(filename) {
+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) {
+export function utf8_to_b64 (str) {
   return window.btoa(unescape(encodeURIComponent(str)))
 }
 
-export function b64_to_utf8(str) {
+export function b64_to_utf8 (str) {
   return decodeURIComponent(escape(window.atob(str)))
 }
+
+export function jsonToCsv (data) {
+  let csv = ''
+  let keys = Object.keys(data[0])
+  csv += keys.join(',') + '\n'
+  data.forEach(row => {
+    csv += keys.map(key => `"${row[key]}"`).join(',') + '\n'
+  })
+  return new Blob([csv], { type: 'text/csv' })
+}
+
+export function downBlob (blob, filename) {
+  const url = window.URL.createObjectURL(blob)
+  const a = document.createElement('a')
+  a.href = url
+  a.download = filename
+  document.body.appendChild(a)
+  a.click()
+  setTimeout(() => {
+    window.URL.revokeObjectURL(url)
+    document.body.removeChild(a)
+  })
+}