diff --git a/Answer/1 ~ 10/3.md b/Answer/1 ~ 10/3.md
new file mode 100644
index 0000000..1e56ec2
--- /dev/null
+++ b/Answer/1 ~ 10/3.md	
@@ -0,0 +1,66 @@
+```js
+// 请使用原生代码实现一个Events模块，可以实现自定义事件的订阅、触发、移除功能
+const fn1 = (... args)=>console.log('I want sleep1', ... args)
+const fn2 = (... args)=>console.log('I want sleep2', ... args)
+const event = new Events();
+event.on('sleep', fn1, 1, 2, 3);
+event.on('sleep', fn2, 1, 2, 3);
+event.fire('sleep', 4, 5, 6);
+// I want sleep1 1 2 3 4 5 6
+// I want sleep2 1 2 3 4 5 6
+event.off('sleep', fn1);
+event.once('sleep', () => console.log('I want sleep'));
+event.fire('sleep');
+// I want sleep2 1 2 3
+// I want sleep
+event.fire('sleep');
+// I want sleep2 1 2 3
+```
+
+今天的题目算是一道常考题了，没有一个标准解法，输出正确就行。
+
+但是如果你能用上一些 ES6 的语法以及处理好一些边界问题，面试官对你的评价会更好点。
+
+```js
+class Events {
+  constructor() {
+    this.events = new Map();
+  }
+
+  addEvent(key, fn, isOnce, ...args) {
+    const value = this.events.get(key) ? this.events.get(key) : this.events.set(key, new Map()).get(key)
+    value.set(fn, (...args1) => {
+        fn(...args, ...args1)
+        isOnce && this.off(key, fn)
+    })
+  }
+
+  on(key, fn, ...args) {
+    if (!fn) {
+      console.error(`没有传入回调函数`);
+      return
+    }
+    this.addEvent(key, fn, false, ...args)
+  }
+
+  fire(key, ...args) {
+    if (!this.events.get(key)) {
+      console.warn(`没有 ${key} 事件`);
+      return;
+    }
+    for (let [, cb] of this.events.get(key).entries()) {
+      cb(...args);
+    }
+  }
+
+  off(key, fn) {
+    if (this.events.get(key)) {
+      this.events.get(key).delete(fn);
+    }
+  }
+
+  once(key, fn, ...args) {
+    this.addEvent(key, fn, true, ...args)
+  }
+}
+```
diff --git a/README.md b/README.md
index 2a617ba..285701f 100644
--- a/README.md
+++ b/README.md
@@ -37,11 +37,17 @@ event.fire('sleep', 4, 5, 6);
 // I want sleep2 1 2 3 4 5 6
 event.off('sleep', fn1);
 event.once('sleep', () => console.log('I want sleep'));
+event.fire('sleep');
+// I want sleep2 1 2 3
 // I want sleep
 event.fire('sleep');
 // I want sleep2 1 2 3
 ```
 
+发现题目有点问题，改动了一下
+
+新建了一个大厂真题每日打卡群，有意愿学习打卡的再进，[打开这个二维码](https://yck-1254263422.cos.ap-shanghai.myqcloud.com/2021/03/09/16152484585655.jpg)。
+
 第二题：[以下代码输出什么，为什么？](https://github.com/KieSun/fucking-frontend/issues/2)，这道题目是第一题的进阶版本，更有趣了。
 
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