<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>计算器</title>
<link rel="stylesheet" href="./styles.css">
</head>
<body>
<div id="calculator">
<input type="text" id="display" disabled>
<div id="buttons">
<button class="operator" onclick="append('(')">(</button>
<button class="operator" onclick="append(')')">)</button>
<button class="operator" onclick="clearDisplay()">C</button>
<button class="operator" onclick="append('/')">/</button>
<button class="num" onclick="append('7')">7</button>
<button class="num" onclick="append('8')">8</button>
<button class="num" onclick="append('9')">9</button>
<button class="operator" onclick="append('*')">*</button>
<button class="num" onclick="append('4')">4</button>
<button class="num" onclick="append('5')">5</button>
<button class="num" onclick="append('6')">6</button>
<button class="operator" onclick="append('-')">-</button>
<button class="num" onclick="append('1')">1</button>
<button class="num" onclick="append('2')">2</button>
<button class="num" onclick="append('3')">3</button>
<button class="operator" onclick="append('+')">+</button>
<button class="num zero" onclick="append('0')">0</button>
<button class="num" onclick="append('.')">.</button>
<button class="operator" onclick="calculate()">=</button>
</div>
</div>
<script src="calculator.js"></script>
</body>
</html>
