diff --git a/.github/workflows/github-actions-demo.yml b/.github/workflows/github-actions-demo.yml
new file mode 100644
index 0000000..75be101
--- /dev/null
+++ b/.github/workflows/github-actions-demo.yml
@@ -0,0 +1,17 @@
+name: GitHub Actions Demo
+on: [push]
+jobs:
+  Explore-GitHub-Actions:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
+      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
+      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - name: Check out repository code
+        uses: actions/checkout@v3
+      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
+      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+      - name: List files in the repository
+        run: |
+          ls ${{ github.workspace }}
+      - run: echo "🍏 This job's status is ${{ job.status }}."
diff --git a/lib/add.js b/lib/add.js
index 1714b95..ccc3f89 100644
--- a/lib/add.js
+++ b/lib/add.js
@@ -1,5 +1,19 @@
-function add() {
+function add(n1,n2) {
   // 实现该函数
+  const n1Arr = n1.split('')
+  const n2Arr = n2.split('')
+  const resultArr = [];
+  let count = 0;
+  const maxLength = n1Arr.length>n2Arr.length?n1Arr.length:n2Arr.length
+  for(let i=maxLength-1;i>=0;i--){
+    const sum = Number(n1Arr[i])+Number(n2Arr[i])+count;
+    resultArr.unshift(sum%10)
+    count = sum>9?1:0
+  }
+  if(count>0){
+    resultArr.unshift(count)
+  }
+  return resultArr.join('')
 }
 
 module.exports = add
\ No newline at end of file