diff --git a/SrcJyAliPublic.js b/SrcJyAliPublic.js
index 8d090aa..a8276f5 100644
--- a/SrcJyAliPublic.js
+++ b/SrcJyAliPublic.js
@@ -444,7 +444,7 @@ function test_aliecc() {
     let nonce = 0;
 
     // 生成私钥和公钥
-    let private_key = BigInt(Math.random() * 2 ** 32);
+    let private_key = BigInt(Math.floor(Math.random() * 2 ** 32));
     let ecc_pri = new ECDSA.ECDSA(private_key, "secp256k1");
     let ecc_pub = ecc_pri.getVerifyingKey();
     let public_key = "04" + ecc_pub.toString();