网页计算器

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<style>
		.box {
			height: 570px;
			width: 500px;
			background-color: deeppink;
			margin: auto;
			border-radius: 10px;
			border: 3px solid black;
		}

		.dtable {
			height: 560px;
			width: 460px;
			margin: auto;
		}

		#txt {
			height: 70px;
			width: 300px;
			font-size: 50px;
			font-family: "黑体";
			font-weight: 200px;
			border: 2px solid black;
		}

		td {
			text-align: center;
			font-size: 20px;
			font-weight: 200;
			margin: auto;
			padding: auto;
		}

		.point {
			height: 80px;
			width: 97px;
			text-align: center;
			padding: auto;
			margin: auto;
			border-radius: 10px;
			border: 2px solid black;
			background-color: hotpink;
			cursor: pointer;
			font-size: 60px;
			font-family: "黑体";
		}
	</style>
	<body>
		<div class="box">
			<table class="dtable">
				<tr>
					<td colspan="3" class="rdt">
						<input type="text" id="txt" value="" />
					</td>
					<td>
						<img src="img/rabbit.gif" alt="">
					</td>
				</tr>
				<tr>
					<td>
						<div class="point" onclick="fun('9')">9</div>
					</td>
					<td>
						<div class="point" onclick="fun('8')">8</div>
					</td>
					<td>
						<div class="point" onclick="fun('7')">7</div>
					</td>
					<td>
						<div class="point" onclick="fun('+')">+</div>
					</td>
				</tr>
				<tr>
					<td>
						<div class="point" onclick="fun('6')">6</div>
					</td>
					<td>
						<div class="point" onclick="fun('5')">5</div>
					</td>
					<td>
						<div class="point" onclick="fun('4')">4</div>
					</td>
					<td>
						<div class="point" onclick="fun('-')">-</div>
					</td>
				</tr>
				<tr>
					<td>
						<div class="point" onclick="fun('3')">3</div>
					</td>
					<td>
						<div class="point" onclick="fun('2')">2</div>
					</td>
					<td>
						<div class="point" onclick="fun('1')">1</div>
					</td>
					<td>
						<div class="point" onclick="fun('*')">×</div>
					</td>
				</tr>
				<tr>
					<td>
						<div class="point" onclick="fun('0')">0</div>
					</td>
					<td>
						<div class="point" onclick="fun('C')">C</div>
					</td>
					<td>
						<div class="point" onclick="fun('=')">=</div>
					</td>
					<td>
						<div class="point" onclick="fun('/')">÷</div>
					</td>
				</tr>
			</table>
		</div>
		<script>
			var s = '';

			function fun(value) {
				var txt = document.getElementById("txt");
				if (value === 'C') {
					s = '';
				} else if (value === '=') {
					s = eval(s);
				} else {
					s += value;
				}
				txt.value = s;
				// alert(s);

			}
		</script>
	</body>
</html>