diff --git a/client/api/Client.ts b/client/api/Client.ts
index d14e212..108b8ec 100644
--- a/client/api/Client.ts
+++ b/client/api/Client.ts
@@ -4,6 +4,7 @@ import ApiCallbackMessage from './ApiCallbackMessage.ts'
 import User from "./client_data/User.ts"
 import data from "../Data.ts"
 import { checkApiSuccessOrSncakbar } from "../ui/snackbar.ts"
+import randomUUID from "../randomUUID.ts"
 
 type UnknownObject = { [key: string]: unknown }
 
@@ -13,7 +14,7 @@ class Client {
     static events: { [key: string]: (data: UnknownObject) => UnknownObject | void } = {}
     static connect() {
         if (data.device_id == null)
-            data.device_id = crypto.randomUUID()
+            data.device_id = randomUUID()
         this.socket?.disconnect()
         this.socket && delete this.socket
         this.socket = io({
diff --git a/client/randomUUID.ts b/client/randomUUID.ts
new file mode 100644
index 0000000..eb660bd
--- /dev/null
+++ b/client/randomUUID.ts
@@ -0,0 +1,34 @@
+// https://www.xiabingbao.com/post/crypto/js-crypto-randomuuid-qxcuqj.html
+// 在此表示感謝
+
+export default function randomUUID() {
+    // crypto - 只支持在安全的上下文使用
+    if (typeof crypto === 'object') {
+        if (typeof crypto.randomUUID === 'function') {
+            // https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID
+            return crypto.randomUUID()
+        }
+        if (typeof crypto.getRandomValues === 'function' && typeof Uint8Array === 'function') {
+            // https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid
+            const callback = (c: string) => {
+                const num = Number(c)
+                return (num ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))).toString(16)
+            };
+            return '10000000-1000-4000-8000-100000000000'.replace(/[018]/g, callback)
+        }
+    }
+    // 隨機數 - fallback
+    let timestamp = new Date().getTime()
+    let perforNow = (typeof performance !== 'undefined' && performance.now && performance.now() * 1000) || 0
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+        let random = Math.random() * 16
+        if (timestamp > 0) {
+            random = (timestamp + random) % 16 | 0
+            timestamp = Math.floor(timestamp / 16)
+        } else {
+            random = (perforNow + random) % 16 | 0
+            perforNow = Math.floor(perforNow / 16)
+        }
+        return (c === 'x' ? random : (random & 0x3) | 0x8).toString(16)
+    })
+}
\ No newline at end of file