diff --git a/lib/Synchronizer.js b/lib/Synchronizer.js
index b380dc3..10a8a67 100644
--- a/lib/Synchronizer.js
+++ b/lib/Synchronizer.js
@@ -38,6 +38,9 @@ function verify(publicKey, body, ts, nonce, signature) {
     return verify2.verify(publicKey, signature, 'hex');
 }
 async function fetchWithTimeout(url, options, timeout = 5000) {
+    if (typeof AbortController === 'undefined' || timeout === 0) {
+        return fetch(url, options);
+    }
     const controller = new AbortController();
     const signal = controller.signal;
     // 设置超时
diff --git a/src/Synchronizer.ts b/src/Synchronizer.ts
index 67f883c..7be23f7 100644
--- a/src/Synchronizer.ts
+++ b/src/Synchronizer.ts
@@ -63,6 +63,9 @@ function verify(publicKey: string, body: string, ts: string, nonce: string, sign
 }
 
 async function fetchWithTimeout(url: string, options: RequestInit, timeout = 5000) {
+    if (typeof AbortController === 'undefined' || timeout === 0) {
+        return fetch(url, options);
+    }
     const controller = new AbortController();
     const signal = controller.signal;