如何创建可重复使用的计算器按键视图：HTML 和 CSS 示例
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="calculator.css">
</head>
<body>
<!-- 其他页面内容 -->
<div>
<!-- 引入计算器视图 -->
<div class="calculator"></div>
</div>
<!-- 其他页面内容 -->
<script src="calculator.js"></script>
</body>
</html>
<div class="calculator">
<div class="row">
<button class="key">7</button>
<button class="key">8</button>
<button class="key">9</button>
</div>
<div class="row">
<button class="key">4</button>
<button class="key">5</button>
<button class="key">6</button>
</div>
<div class="row">
<button class="key">1</button>
<button class="key">2</button>
<button class="key">3</button>
</div>
<div class="row">
<button class="key">0</button>
<button class="key">+</button>
<button class="key">-</button>
</div>
</div>
<p>.calculator {
display: inline-block;
border: 1px solid #ccc;
padding: 10px;
}</p>
<p>.row {
display: flex;
}</p>
<p>.key {
flex: 1;
margin: 5px;
padding: 10px;
font-size: 16px;
text-align: center;
cursor: pointer;
}</p>
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