Submit exercise 2 - Chris Wang

.github/workflows/node.js.yml

@@ -0,0 +1,22 @@
+name: Auto Test CI
+
+on:
+  push:
+    branches: ['master']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [16.x]
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+      - run: npm i
+      - run: npm run test

Readme.md

@@ -1,4 +1,4 @@
-# Readme
+# Readme [![Node.js CI](https://github.com/chris-wang/exercise2/actions/workflows/node.js.yml/badge.svg)](https://github.com/chris-wang/exercise2/actions/workflows/node.js.yml)
 
 ### 步骤
 
@@ -20,4 +20,4 @@ npm run test
 ### 参考
 
 * [Jest](https://jestjs.io/zh-Hans/)
-* [Github Actions](https://docs.github.com/cn/actions)
+* [Github Actions](https://docs.github.com/cn/actions)

lib/add.js

@@ -1,5 +1,22 @@
-function add() {
+function add(num1, num2) {
   // 实现该函数
+  let maxLength = Math.max(num1.length, num2.length);
+  num1 = num1.padStart(maxLength, '0');
+  num2 = num2.padStart(maxLength, '0');
+
+  let temp = 0;
+  let flag = 0;
+  let result = '';
+  for (let i = maxLength - 1; i >= 0; i--) {
+    temp = parseInt(num1[i]) + parseInt(num2[i]) + flag;
+    flag = Math.floor(temp / 10);
+    result = (temp % 10) + result;
+  }
+
+  if (flag === 1) {
+    result = '1' + result;
+  }
+  return result;
 }
 
-module.exports = add
+module.exports = add;