---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 26 - addEventListener 事件監聽
### addEventListener 語法
`.addEventListener()` 前面會放欲選取的元素，
`addEventListener()` 內通常會代入兩個參數，第一個參數為事件類型，第二個參數觸發事件後要執行的動作（函式）
範例：
HTML
```htmlembedded=
<p class="domElement">123</p>
```
JS
```javascript=
const domElement = document.querySelector(".domElement");
domElement.addEventListener("click", function(e) {
// 觸發時欲執行的程式
console.log(e);
// 以此範例來說，點擊 p.domElement 元素時就會印出參數 e（參數名稱可以自訂，這邊定為 e 有 event 的意思）
// 此參數為一個事件物件，包含了與此事件有關的屬性
// 可以嘗試觀看 e 的內容
// 像是：
// target 屬性為觸發事件時的元素
// type 屬性為觸發事件的類型
});
```
> 在指定元素（domElement）監聽特定事件（此範例為 click 事件，需使用引號），當該事件觸發時會執行後方函式，函式有一個參數為事件物件
### 常用事件介紹
1. click：滑鼠點擊元素時會觸發
2. change：當表單內容改變時會觸發
3. scroll：滾動時觸發
> 更多可以再觀看 [文件](https://developer.mozilla.org/zh-TW/docs/Web/Events)
補充：
- [MDN 文件](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
- https://israynotarray.com/javascript/20190919/1187569768/
問題
---
監聽下方元素（.plusOne），當點擊「+1」按鈕時，可以讓 sum 的值 +1，並使用 console.log 印出 sum。
HTML
```htmlembedded=
<button type="button" class="plusOne">＋1</button>
```
JS
```javascript=
let sum = 0;
/* 程式碼撰寫 */
...
```
## 回報流程
將答案寫在 CodePen 並複製 CodePen 連結貼至底下回報就算完成了喔!
解答位置請參考下圖（需打開程式碼的部分觀看）
<!-- 解答：
let sum = 0;
/* 程式碼撰寫 */
const plusOne = document.querySelector(".plusOne");
plusOne.addEventListener("click", function() {
sum++;
console.log(sum);
})
-->
回報區
---
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