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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>计算器</title>
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<style>
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/* 设置顶部标题栏样式 */
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#top {
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width: 450px;
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height: 50px;
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margin: auto;
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background-color: #4278bb;
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border-radius: 10px 10px 0px 0px;
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}
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/* 设置标题样式 */
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#calc-title {
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font-size: 22px;
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color: white;
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float: left;
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margin: 10px 10px 0px 200px;
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}
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/* 设置结果显示样式 */
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#result {
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width: 445px;
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height: 60px;
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margin: auto;
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font-size: 40px;
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background-color: white;
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border: solid 3px #4278bb;
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}
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/* 设置按钮样式 */
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#button {
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width: 450px;
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height: 422px;
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background-color: #4278bb;
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margin: auto;
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}
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#button div {
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width: 108px;
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height: 80px;
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float: left;
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background-color: #7ecbff;
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margin: 2px;
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line-height: 80px;
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text-align: center;
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font-size: 26px;
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}
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#button div:hover {
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background-color: rgb(48, 149, 203);
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}
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</style>
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<script type="text/javascript">
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// 传递输入的数字
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function clickNumber(number) {
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var result = document.getElementById("result");
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result.innerHTML = result.innerHTML + number;
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}
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//传递输入运算符
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function clickOperator(operator) {
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var result = document.getElementById("result");
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var string = result.innerHTML;
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var len = string.length;
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var last = string.charAt(len - 1);
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if (last == "+" || last == "-" || last == "*" || last == "/" || last == "%") {
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var temp = string.substr(0, len - 1) + operator;
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result.innerHTML = temp;
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} else {
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result.innerHTML += operator;
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}
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}
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// 输入小数点
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function clickPonit() {
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var result = document.getElementById("result");
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var string = result.innerHTML;
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var len = string.length;
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var last = string.charAt(len - 1);
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if (last !== ".") {
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result.innerHTML = result.innerHTML + ".";
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} else {
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result.innerHTML = result.innerHTML;
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}
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}
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// 清空输入
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function clearresult() {
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var result = document.getElementById("result");
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result.innerHTML = "";
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}
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// 删除操作
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function del() {
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var result = document.getElementById("result");
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var string = result.innerHTML;
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if (string.length > 0) {
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result.innerHTML = string.slice(0, -1);
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}
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}
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// 计算结果eval参数
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function doCalc() {
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var result = document.getElementById("result");
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var expression = result.innerHTML;
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result.innerHTML = eval(expression);
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}
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</script>
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</head>
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<body>
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<div id="top">
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<div id="calc-title">计算器</div>
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</div>
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<div id="result">
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</div>
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<div id="button">
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<div onclick="clearresult()">AC</div>
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<div onclick="clickOperator('/')">÷</div>
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<div onclick="clickOperator('*')">x</div>
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<div onclick="del()">删除</div>
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<div onclick="clickNumber(7)">7</div>
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<div onclick="clickNumber(8)">8</div>
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<div onclick="clickNumber(9)">9</div>
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<div onclick="clickOperator('%')">%</div>
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<div onclick="clickNumber(4)">4</div>
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<div onclick="clickNumber(5)">5</div>
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<div onclick="clickNumber(6)">6</div>
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<div onclick="clickOperator('-')">-</div>
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<div onclick="clickNumber(1)">1</div>
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<div onclick="clickNumber(2)">2</div>
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<div onclick="clickNumber(3)">3</div>
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<div onclick="clickOperator('+')">+</div>
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<div></div>
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<div onclick="clickNumber(0)">0</div>
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<div onclick="clickPonit()">.</div>
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<div onclick="doCalc()">=</div>
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</div>
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</body>
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</html>
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