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原生JavaScript实现网页版计算器

2021-11-09 04:08 1341 查看

本文实例为大家分享了JavaScript实现网页版计算器的具体代码，供大家参考，具体内容如下

由于无聊看电脑上的系统软件翻到了计算器这个功能，就简单写一下这个计算器的功能吧，这个网页版计算器基本功能都有吧，但是不是很完全，仅供参考。

首先是网页计算器的样式部分不想手写直接复制即可

<!DOCTYPE html>
<html lang="zh-CN">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

.cal {
width: 420px;
margin: 100px auto;
background-color: #E6E6E6;

padding: 2px;
overflow: hidden;
}

.show {
position: relative;
width: 416px;
height: 120px;

font-size: 50px;
line-height: 50px;
font-weight: 700;
}

.show button {
display: none;

position: absolute;
top: -2px;
right: -2px;

width: 60px;
height: 40px;
line-height: 40px;
text-align: center;
border: transparent;
background-color: #E6E6E6;

font-size: 30px;
font-weight: 100;
cursor: pointer;
}

.show button:hover {
background-color: #e81123;
color: #f0f0f0
}

.res,
.left,
.right {
position: absolute;
bottom: 0;

height: 60px;
line-height: 60px;
padding: 0 3px;
}

.res {
right: 0;
/* width: 100%; */

text-align: right;
}

.left {
display: none;
background-color: #E6E6E6;
}

.right {
display: none;
right: 0;
background-color: #E6E6E6;
}

.left:hover,
.right:hover {
color: #2e8eda;
}

.keyboard {
display: flex;
flex-wrap: wrap;
justify-content: center;
}

.btn {
display: flex;
justify-content: center;

width: 100px;
height: 60px;
line-height: 60px;
margin: 2px;

background-color: #f0f0f0;
border: transparent;

font-size: large;
}

.btn:hover {
background-color: #d6d6d6;
}

.digital {
background-color: #fafafa;
font-weight: 700;
}

.equal {
background-color: #8abae0;
}

.equal:hover {
background-color: #4599db;
}
</style>
</head>

<body>

<div class="cal">
<div class="show">
<button class="close">×</button>
<div class="res">0</div>
<div class="left">&lt;</div>
<div class="right">&gt;</div>
</div>
<div class="keyboard">
<!-- 0 -->
<button class="btn percent">%</button>
<!-- 1 -->
<button class="btn clearOne">CE</button>
<!-- 2 -->
<button class="btn clearAll">C</button>
<!-- 3 -->
<button class="btn back">del</button>
<!-- 4 -->
<button class="btn div1">1/x</button>
<!-- 5 -->
<button class="btn square">x²</button>
<!-- 6 -->
<button class="btn sqrt">²√x</button>
<!-- 7 -->
<button class="btn div">÷</button>
<!-- 8 -->
<button class="btn digital">7</button>
<!-- 9 -->
<button class="btn digital">8</button>
<!-- 10 -->
<button class="btn digital">9</button>
<!-- 11 -->
<button class="btn mul">x</button>
<!-- 12 -->
<button class="btn digital">4</button>
<!-- 13 -->
<button class="btn digital">5</button>
<!-- 14 -->
<button class="btn digital">6</button>
<!-- 15 -->
<button class="btn sub">-</button>
<!-- 16 -->
<button class="btn digital">1</button>
<!-- 17 -->
<button class="btn digital">2</button>
<!-- 18 -->
<button class="btn digital">3</button>
<!-- 19 -->
<button class="btn add">+</button>
<!-- 20 -->
<button class="btn neg">+/-</button>
<!-- 21 -->
<button class="btn digital">0</button>
<!-- 22 -->
<button class="btn digital">.</button>
<!-- 23 -->
<button class="btn equal">=</button>
</div>
</div>
<script src="./计算机.js"></script>
</body>

</html>

js部分:

const bt = document.querySelectorAll('.keyboard button')
const close = document.querySelector('.close')
const res = document.querySelector('.res')
//当点击的数字的时候
let k = 0
let one
let two
function arr(num) {
bt[num].onclick = function () {
res.innerText += bt[num].innerText
res.innerText = parseFloat(res.innerText)
// console.log(one)

}
}
//小数点
//保留结果小数
function fn() {
if (res.innerText.length > 8) {
res.innerText = res.innerText.slice(0, 10)
}
if (res.innerText == 'NaN') {
res.innerText = 0
}

}

//当点击的是运算符号的时候
function symbol(str, fu) {
bt[str].onclick = function () {
k++
if (k > 1) {
return
}
one = parseFloat(res.innerText)
// switch (fu) {
//     case '+':
//         one += one
//         break;
//     case '-':
//         one -= one
//         break;
//     case '*':
//         one *= one
//         break;
//     case '/':
//         one /= one
//         break;
// }
res.innerText = ''
close.style.display = 'block'
close.innerText = bt[str].innerText
console.log(one)
}
}

arr(21)
arr(18)
arr(17)
arr(16)
arr(14)
arr(13)
arr(12)
arr(10)
arr(9)
arr(8)
arr(22)
//运算符号
symbol(0)
symbol(7, '/')
symbol(11, '*')
symbol(15, '-')
symbol(19, '+')
console.log(bt[22].innerText)
bt[22].onclick = function () {
res.innerText += bt[22].innerText
console.log(565)
}
bt[23].onclick = function () {
two = parseFloat(res.innerText)
switch (close.innerText) {
case '%':
//toFixed(11)保留11位小数
res.innerText = one % two
k = 0
break;
case '+':
res.innerText = one + two
k = 0
break;
case '-':
res.innerText = one - two
k = 0
break;
case 'x':
res.innerText = one * two
k = 0
break;
case '÷':
res.innerText = one / two
k = 0
break;
}
// console.log(res.innerText.length)
fn()

}
bt[1].onclick = function () {
res.innerText = ''
}
bt[2].onclick = function () {
res.innerText = '0'
close.innerText = 'x'
close.style.display = ''
one = 0
two = 0
}
bt[3].onclick = function () {
res.innerText = res.innerText.slice(0, res.innerText.length - 1)
if (res.innerText.length === 0) {
res.innerText = '0'
return
}
}
bt[4].onclick = function () {
res.innerText = 1 / parseFloat(res.innerText)
fn()
}
bt[5].onclick = function () {
res.innerText = parseFloat(res.innerText) * parseFloat(res.innerText)
fn()
}

bt[6].onclick = function () {
res.innerText = Math.sqrt(parseFloat(res.innerText))
fn()
}
bt[20].onclick = function () {
res.innerText = 0 - parseFloat(res.innerText)
fn()
}

以上代码就把一个简单的计算机做好了，希望对大家的学习有所帮助

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标签： js 网页计算器

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