diff --git a/.github/workflows/learning_github_actions.yml b/.github/workflows/learning_github_actions.yml
new file mode 100644
index 0000000..19a75da
--- /dev/null
+++ b/.github/workflows/learning_github_actions.yml
@@ -0,0 +1,12 @@
+name: learning-github-actions
+on: [push]
+jobs:
+  run-test-case:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "16"
+      - run: yarn
+      - run: yarn test
diff --git a/lib/add.js b/lib/add.js
index 1714b95..2d90eca 100644
--- a/lib/add.js
+++ b/lib/add.js
@@ -1,5 +1,36 @@
 function add() {
   // 实现该函数
+  if(arguments.length !== 2){
+    throw new Error('wrong argument');
+  }
+  let a = '' + arguments[0];
+  let b = '' + arguments[1];
+  if(isNaN(parseInt(a)) || isNaN(parseInt(b))){
+    throw new TypeError('wrong type');
+  }
+
+  a = a.split('');
+  b = b.split('');
+  let lenA = a.length;
+  let lenB = b.length;
+  let temp = [];
+  let len = lenA > lenB ? lenA : lenB;
+
+  let tempA = 0;
+  let tempB = 0;
+  for(let i=1;i<=len;i++){
+    tempA = a[lenA-i] || 0;
+    tempB = b[lenB-i] || 0;
+    temp.push(parseInt(tempA)+parseInt(tempB));
+  }
+
+  for(let j=0;j<len;j++){
+    if(temp[j] >= 10){
+      temp[j+1] += 1;
+      temp[j] -= 10;
+    }
+  }
+  return temp.reverse().join('');
 }
 
 module.exports = add
\ No newline at end of file
diff --git a/test/test.spec.js b/test/test.spec.js
index 935b70e..901620a 100644
--- a/test/test.spec.js
+++ b/test/test.spec.js
@@ -1,6 +1,21 @@
 var add = require('../lib/add')
 
 describe('大数相加add方法', function () {
+  
+  test('参数不等于两个时，提示参数错误',function(){
+    expect(
+      ()=>{
+        add('123')
+      }
+    ).toThrow(Error)
+  })
+
+  test('非数字类型或字符类型数字时报错',function(){
+    expect(()=>{
+      add('abc','123');
+    }).toThrow(TypeError);
+  })
+
   test('字符串"42329"加上字符串"21532"等于"63861"', function () {
     expect(add('42329', '21532')).toBe('63861')
   })
@@ -8,4 +23,12 @@ describe('大数相加add方法', function () {
   test('"843529812342341234"加上"236124361425345435"等于"1079654173767686669"', function () {
     expect(add('843529812342341234', '236124361425345435')).toBe('1079654173767686669')
   })
+
+  test('"123456"加上"123"等于123579',function(){
+    expect(add('123456',123)).toBe('123579');
+  })
+
+  test('"123456"加上"999"等于12455',function(){
+    expect(add('123456',999)).toBe('124455');
+  })
 })
\ No newline at end of file