HTML & JavaScript 计算器：构建简单易用的在线计算器
<!DOCTYPE html>
<html>
<head>
<title>计算器</title>
<style>
.container {
width: 300px;
margin: 50px auto;
border: 1px solid #ccc;
padding: 10px;
}
input[type="button"] {
width: 64px;
height: 64px;
font-size: 20px;
}
</style>
</head>
<body>
<div class="container">
<input type="text" id="result" readonly>
<br>
<input type="button" value="1" onclick="appendNumber(1)">
<input type="button" value="2" onclick="appendNumber(2)">
<input type="button" value="3" onclick="appendNumber(3)">
<input type="button" value="+" onclick="appendOperator('+')">
<br>
<input type="button" value="4" onclick="appendNumber(4)">
<input type="button" value="5" onclick="appendNumber(5)">
<input type="button" value="6" onclick="appendNumber(6)">
<input type="button" value="-" onclick="appendOperator('-')">
<br>
<input type="button" value="7" onclick="appendNumber(7)">
<input type="button" value="8" onclick="appendNumber(8)">
<input type="button" value="9" onclick="appendNumber(9)">
<input type="button" value="*" onclick="appendOperator('*')">
<br>
<input type="button" value="0" onclick="appendNumber(0)">
<input type="button" value="." onclick="appendDecimal()">
<input type="button" value="=" onclick="calculate()">
<input type="button" value="/" onclick="appendOperator('/')">
<br>
<input type="button" value="C" onclick="clearResult()">
</div>
<script>
function appendNumber(number) {
var result = document.getElementById("result");
result.value += number;
}
function appendOperator(operator) {
var result = document.getElementById("result");
result.value += operator;
}
function appendDecimal() {
var result = document.getElementById("result");
result.value += ".";
}
function calculate() {
var result = document.getElementById("result");
try {
result.value = eval(result.value);
} catch (error) {
result.value = "Error";
}
}
function clearResult() {
var result = document.getElementById("result");
result.value = "";
}
</script>
</body>
</html>
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