From 04b4dc56e30bdf61920924bd01571858ce007dc0 Mon Sep 17 00:00:00 2001
From: suxiao <xiao.su@yunzhanghu.com>
Date: Sun, 28 Jun 2020 20:12:17 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E4=BF=AE=E5=A4=8D=E8=B4=9F=E6=95=B0?=
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---
 src/index.ts       |  6 +++++-
 test/index.test.ts | 13 +++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 4e5f509..6f48e3a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -106,7 +106,11 @@ function divide(num1: numType, num2: numType, ...others: numType[]): number {
  */
 function round(num: numType, ratio: number): number {
   const base = Math.pow(10, ratio);
-  return divide(Math.round(times(num, base)), base);
+  let result = divide(Math.round(Math.abs(times(num, base))), base);
+  if (num < 0 && result !== 0) {
+    result = times(result, -1);
+  }
+  return result;
 }
 
 let _boundaryCheckingState = true;
diff --git a/test/index.test.ts b/test/index.test.ts
index 197daf7..bab3f1b 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -248,4 +248,17 @@ test('NP.round can do round operation', (t) => {
   t.true(NP.round('1.2345e3', 3) === 1234.5);
   t.true(NP.round('1.2344e3', 3) === 1234.4);
   t.true(NP.round('1e3', 1) === 1000);
+
+  t.true(NP.round('-0.125', 2) === -0.13);
+  t.true(NP.round('-0.001', 2) === 0.00);
+  t.true(NP.round('-0.005', 2) === -0.01);
+  t.true(NP.round('0.125', 2) === 0.13);
+  t.true(NP.round('0.001', 2) === 0.00);
+  t.true(NP.round('0.005', 2) === 0.01);
+  t.true(NP.round(-0.125, 2) === -0.13);
+  t.true(NP.round(-0.001, 2) === 0.00);
+  t.true(NP.round(-0.005, 2) === -0.01);
+  t.true(NP.round(0.125, 2) === 0.13);
+  t.true(NP.round(0.001, 2) === 0.00);
+  t.true(NP.round(0.005, 2) === 0.01);
 });