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event-agent-calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>事件代理的应用示例 - 计算器(升级版)</title>
<style>
#event-table td {
border: solid 1px goldenrod;
width: 100px;
height: 50px;
text-align: center;
cursor: pointer;
}
#event-table td:hover {
background-color: hotpink;
}
</style>
</head>
<body>
<section>
<h2>事件代理的应用示例 - 计算器(升级版)</h2>
<table id="event-table">
<tbody>
<tr>
<td>Inv</td>
<td>Rad</td>
<td>x!</td>
<td>(</td>
<td>)</td>
<td>c</td>
<td>del</td>
</tr>
<tr>
<td>In</td>
<td>sin</td>
<td>%</td>
<td>7</td>
<td>8</td>
<td>9</td>
<td>÷</td>
</tr>
<tr>
<td>log</td>
<td>cos</td>
<td>√</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>x</td>
</tr>
<tr>
<td>^</td>
<td>tan</td>
<td>1/x</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>−</td>
</tr>
<tr>
<td>Exp</td>
<td>π</td>
<td>e</td>
<td>0</td>
<td>.</td>
<td>=</td>
<td>+</td>
</tr>
</tbody>
</table>
</section>
</body>
<script>
/* 事件代理 */
const $eventTable = document.getElementById('event-table');
$eventTable.addEventListener('click', (event) => {
// event.stopPropagation();
console.log(event);
alert(event.target.innerHTML);
})
</script>
</html>