From b57e9bd11bfad25775906ee002dbcb587784352c Mon Sep 17 00:00:00 2001
From: aozhiwei <aozhiwei@kingsome.cn>
Date: Wed, 2 Nov 2022 21:42:21 +0800
Subject: [PATCH] 1

---
 bcutils.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bcutils.js b/bcutils.js
index 1d598bc..e55c990 100644
--- a/bcutils.js
+++ b/bcutils.js
@@ -97,13 +97,13 @@ function isValidTransId(transId) {
 }
 
 function extractParamsFromTransId(transId) {
-  if (isValidTransId(transId)) {
+  if (!isValidTransId(transId)) {
     return null;
   }
   const transIdStr = transId.toString();
   const params = [];
   for (let i = 0; i < 3; ++i) {
-    const param = transId.substr(transIdStr.length - 20 * i , 20);
+    const param = transId.substr(transIdStr.length - 20 * (3 - i), 20);
     params.push(utils.removeLeadZero(param));
   }
   return params;