本文实例为大家分享了javascript实现计算器功能的具体代码，供大家参考，具体内容如下
问题描述：
1、除法操作时，如果被除数为0，则结果为0
2、结果如果为小数，最多保留小数点后两位，如2 / 3 =0.67（显示0.67），1 / 2 = 0.5（显示0.5）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度笔试0329</title>
<style type="text/css">
body, ul, li,select {
margin: 0;
padding: 0;
box-sizing: border-box;
}
ul,li {list-style: none;}
.calculator {
max-width: 300px;
margin: 20px auto;
border: 1px solid #eee;
border-radius: 3px;
}
.cal-header {
font-size: 16px;
color: #333;
font-weight: bold;
height: 48px;
line-height: 48px;
border-bottom: 1px solid #eee;
text-align: center;
}
.cal-main {
font-size: 14px;
}
.cal-main .origin-value {
padding: 15px;
height: 40px;
line-height: 40px;
font-size: 20px;
text-align: right;
overflow: hidden;
text-overflow:ellipsis;
white-space: nowrap;
}
.cal-main .origin-type,
.cal-main .target-type {
padding-left: 5px;
width: 70px;
font-size: 14px;
height: 30px;
border: 1px solid #eee;
background-color: #fff;
vertical-align: middle;
margin-right: 10px;
border-radius: 3px;
}
.cal-keyboard {
overflow: hidden;
}
.cal-items {
overflow: hidden;
}
.cal-items li {
user-select: none;
float: left;
display: inline-block;
width: 75px;
height: 75px;
text-align: center;
line-height: 75px;
border-top: 1px solid #eee;
border-left: 1px solid #eee;
box-sizing: border-box;
}
li:nth-of-type(4n+1) {
border-left: none;
}
li[data-action=operator] {
background: #f5923e;
color: #fff;
}
.buttons {
float: left;
width: 75px;
}
.buttons .btn {
width: 75px;
background-color: #fff;
border-top: 1px solid #eee;
border-left: 1px solid #eee;
height: 150px;
line-height: 150px;
text-align: center;
}
.btn-esc {
color: #ff5a34;
}
.btn-backspace {
position: relative;
}
</style>
</head>
<body>
<div class="calculator">
<header class="cal-header">简易计算器</header>
<main class="cal-main">
<div class="origin-value">0</div>
<div class="cal-keyboard">
<ul class="cal-items">
<li data-action="num">7</li>
<li data-action="num">8</li>
<li data-action="num">9</li>
<li data-action="operator">÷</li>
<li data-action="num">4</li>
<li data-action="num">5</li>
<li data-action="num">6</li>
<li data-action="operator">x</li>
<li data-action="num">1</li>
<li data-action="num">2</li>
<li data-action="num">3</li>
<li data-action="operator">-</li>
<li data-action="num">0</li>
<li data-action="operator">清空</li>
<li data-action="operator">=</li>
<li data-action="operator">+</li>
</ul>
</div>
</main>
</div>
<script type="text/javascript">
var Calculator = {
init: function () {
var that = this;
if (!that.isInited) {
that.isInited = true;
// 保存操作信息
// total: Number, 总的结果
// next: String, 下一个和 total 进行运算的数据
// action: String, 操作符号
that.data = {total: 0, next: '', action: ''};
that.bindEvent();
}
},
bindEvent: function () {
var that = this;
// 请补充代码：获取 .cal-keyboard 元素
var keyboardEl = document.getElementsByClassName('cal-keyboard')[0]
keyboardEl && keyboardEl.addEventListener('click', function (event) {
// 请补充代码：获取当前点击的dom元素
var target = event.target;
// 请补充代码：获取target的 data-action 值
var action = target.getAttribute('data-action');
// 请补充代码：获取target的内容
var value = target.innerHTML;
if (action === 'num' || action === 'operator') {
that.result(value, action === 'num');
}
});
},
result: function (action, isNum) {
var that = this;
var data = that.data;
if (isNum) {
data.next = data.next === '0' "_blank" href="https://www.jb51.net/Special/162.htm">计算器功能汇总 进行学习
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