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html代码：

<div class="container">
<div class="output" id="output">0</div>
<button class="button" onclick="clearOutput()" id="clear">C</button>
<button class="button" onclick="appendToOutput('%')">%</button>
<button class="button" onclick="appendToOutput('/')">/</button>
<button class="button" onclick="appendToOutput('*')">*</button>
<button class="button" onclick="appendToOutput('7')">7</button>
<button class="button" onclick="appendToOutput('8')">8</button>
<button class="button" onclick="appendToOutput('9')">9</button>
<button class="button" onclick="appendToOutput('-')">-</button>
<button class="button" onclick="appendToOutput('4')">4</button>
<button class="button" onclick="appendToOutput('5')">5</button>
<button class="button" onclick="appendToOutput('6')">6</button>
<button class="button" onclick="appendToOutput('+')">+</button>
<button class="button" onclick="appendToOutput('1')">1</button>
<button class="button" onclick="appendToOutput('2')">2</button>
<button class="button" onclick="appendToOutput('3')">3</button>
<button class="button equals" onclick="calculate()">=</button>
<button class="button" onclick="appendToOutput('0')">0</button>
<button class="button" onclick="appendToOutput('.')">.</button>
</div>

 

js代码:

let output = document.getElementById("output");

function appendToOutput(value) {
if (output.innerH喵L === "0") {
output.innerH喵L = value;
} else {
output.innerH喵L += value;
}
}

function clearOutput() {
output.innerH喵L = "0";
}

function calculate() {
output.innerH喵L = eval(output.innerH喵L);
}

 

css代码:

body {
background-color: #f2f2f2;
font-family: Arial, sans-serif;
}

.container {
margin: auto;
margin-top: 100px;
width: 300px;
padding: 10px;
border: 1px solid #ccc;
background-color: #fff;
box-shadow: 0px 0px 10px #ccc;
}

.output {
font-size: 2em;
text-align: right;
padding: 10px;
background-color: #eee;
border: 1px solid #ccc;
}

.button {
font-size: 1.5em;
margin: 5px;
width: 50px;
height: 50px;
border: none;
background-color: #ccc;
color: #fff;
cursor: pointer;
}

.button:hover {
background-color: #999;
}

.clear {
background-color: #ff6666;
}

.equals {
background-color: #66cc66;
}