JavaScript Events
w3schools :https://www.w3schools.com/js/js_events.asp
HTML Events 事件
HTML 事件可以是瀏覽器執行的操作，也可以是使用者執行的操作。
Here are some examples of HTML events:
- An HTML web page has finished loading
- An HTML input field was changed
- An HTML button was clicked
HTML 允許使用 JavaScript 程式碼將事件處理程序屬性新增至 HTML 元素。
附單引號：
<element event='some JavaScript'>
附雙引號：
<element event="some JavaScript">
在以下範例中，onclick將屬性（帶有程式碼）新增至 <button>元素：
<button onclick="document.getElementById('demo').innerHTML = Date()">The time is?</button>
Common HTML Events
onclick 可以置換別的觸發狀態，如下：
| Event | Description |
|---|---|
| onchange | An HTML element has been changed |
| onclick | The user clicks an HTML element |
| onmouseover | The user moves the mouse over an HTML element |
| onmouseout | The user moves the mouse away from an HTML element |
| onkeydown | The user pushes a keyboard key |
| onload | The browser has finished loading the page |
補充
element 可被設定監聽(listen)
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