diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
new file mode 100644
index 0000000..9d0a9ce
--- /dev/null
+++ b/.github/workflows/node.js.yml
@@ -0,0 +1,30 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    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 install
+    - run: npm test
diff --git a/lib/add.js b/lib/add.js
index 1714b95..795b752 100644
--- a/lib/add.js
+++ b/lib/add.js
@@ -1,5 +1,33 @@
-function add() {
+function add(num1, num2) {
   // 实现该函数
+  let aNum1 = num1.split("").reverse();
+  let aNum2 = num2.split("").reverse();
+  let maxANum, minANum;
+  if (aNum1.length > aNum2.length) {
+    maxANum = aNum1;
+    minANum = aNum2;
+  } else {
+    maxANum = aNum2;
+    minANum = aNum1;
+  }
+  // 进位标识
+  let minLen = minANum.length;
+  let flag = 0;
+  for (let i = 0; i < minLen; i++) {
+    let sum = +maxANum[i] + +minANum[i] + flag;
+    maxANum[i] = sum % 10;
+    flag = parseInt(sum / 10);
+  }
+  if (flag == 1) {
+    minLen++;
+    if (maxANum[minLen]) {
+      maxANum[minLen]++;
+    } else {
+      maxANum[minLen] = 1;
+    }
+  }
+
+  return maxANum.reverse().join("");
 }
 
-module.exports = add
\ No newline at end of file
+module.exports = add;