优化图片上传，加入图床同步功能

src/utils/upload.js

@@ -0,0 +1,11 @@
+import axios from 'axios'
+import { getToken } from '@/utils/auth'
+
+export function upload(api, file) {
+  var data = new FormData()
+  data.append('file', file)
+  const config = {
+    headers: { 'Authorization': getToken() }
+  }
+  return axios.post(api, data, config)
+}