"B1A4 - What's Happening" 的韓文歌詞如下：
너무나 완벽하게 봐 완벽히 예쁜걸 봐
널 보면 왜 이래도 돼 이런 너를 처음 봤잖아
많이 바ولو쳐 봐 나에겐 아무리 바tempt 아 Nigga that ain't gonna change 난 다를바 찾지 않아 oh my god 이게 다야 바쁠때 만져 니 욤딱 이래서 기다리지 말아 Oh you already know, You know you the shit that i see I can't lie and tell a damn lie But my problem is now they saying shit I don't want your bitch with them hoods or for us What I said to my homeboys ain't gon be fucked up With these girl girls i said Noooooooo A-1 so much work you could use like your belt u ready to have sex Let's roll back time I want u for tonight Then tomorrow when I get back, Gonna let me fuck u then i get up get out i see you all back with u hoodies and they laughing bout their lack of strategy通過點擊頁面中的按鈕來添加和刪除按鈕實例
為了實現這個功能，您需要使用JavaScript來操作DOM元素。以下是一個簡單的示例代碼，演示如何通過點擊頁面中的按鈕來添加和刪除按鈕實例：
HTML代碼：
```html
```
JavaScript代碼：
```javascript
// 獲取頁面中的按鈕元素和容器元素
const addButton = document.getElementById('addButton');
const removeButton = document.getElementById('removeButton');
const buttonsContainer = document.getElementById('buttonsContainer');
// 添加按鈕實例的函式
function addButtonInstance() {
// 創建新的按鈕元素並添加到容器中
const newButton = document.createElement('button');
newButton.textContent = '按鈕實例';
buttonsContainer.appendChild(newButton);
}
// 刪除按鈕實例的函式
function removeButtonInstance() {
// 從容器中移除最後一個按鈕元素
buttonsContainer.lastElementChild.remove();
}
// 處理添加按鈕實例的點擊事件
addButton.addEventListener('click', () => {
addButtonInstance();
});
// 處理刪除按鈕實例的點擊事件
removeButton.addEventListener('click', () => {
removeButtonInstance();
});
```
在上面的代碼中，我們首先獲取了頁面中的按鈕元素和容器元素。然後，我們定義了兩個函式：`addButtonInstance()`用於添加新的按鈕實例到容器中，`removeButtonInstance()`用於從容器中刪除最後一個按鈕實例。最後，我們為添加按鈕實例的點擊事件和刪除按鈕實例的點擊事件分別添加了事件監聽器。當用戶點擊添加按鈕時，會調用`addButtonInstance()`函式來添加新的按鈕實例；當用戶點擊刪除按鈕時，會調用`removeButtonInstance()`函式來刪除最後一個按鈕實例。這樣，就可以通過點擊頁面中的按鈕來動態地添加和刪除按鈕實例了。