From 5a8034b5a1303324bdc875e254792f9eda7be979 Mon Sep 17 00:00:00 2001
From: liyonglu123 <1719867125@qq.com>
Date: Sat, 20 Aug 2022 23:34:07 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E4=B8=A4=E4=B8=AA=E5=A4=A7=E6=95=B0?=
 =?UTF-8?q?=E7=9B=B8=E5=8A=A0?=
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---
 lib/add.js | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/lib/add.js b/lib/add.js
index 1714b95..f3f59aa 100644
--- a/lib/add.js
+++ b/lib/add.js
@@ -1,5 +1,30 @@
-function add() {
-  // 实现该函数
+  function add(a, b) {
+    // 实现该函数
+    if (typeof a === 'number') a = String(a)
+    if (typeof b === 'number') b = String(b)
+
+    //取两个数字的最大长度
+    const maxLength = Math.max(a.length, b.length)
+
+    //用0去补齐长度
+    a = a.padStart(maxLength, 0)
+    b = b.padStart(maxLength, 0)
+
+    let temp = 0
+    // 进位的标志
+    let carry = 0 
+    let sum = ''
+
+    for(let i = maxLength - 1; i >=0; i--) {
+      temp = parseInt(a[i]) + parseInt(b[i]) + carry
+      carry = Math.floor(temp / 10)
+      sum = temp % 10 + sum
+    }
+
+    if (carry === 1) {
+        sum = '1' + sum
+    }
+    return sum
 }
 
 module.exports = add
\ No newline at end of file