本文实例为大家分享了js+css实现计算器功能的具体代码，供大家参考，具体内容如下
目前仅实现了最基础的运算功能
(因为是js的运算内核，有些小数点计算并不准确，懒得去做去小数点后几位的操作）
一、最终呈现的视图效果
二、思路
代码量有点多，没办法。一开始只是无聊随便写的，没有构思，越写到后面越冗杂，自己又不想重新推翻去写。
三、代码逻辑
<style>
* {
margin: 0;
padding: 0;
}
.content {
width: 350px;
height: 530px;
position: relative;
background-color: #E6E6E6;
border: 1px solid #000;
margin: 100px auto;
/* overflow: hidden; */
box-shadow: 0px 0px 10px #888888;
}
.header {
height: 30px;
line-height: 30px;
padding-left: 10px;
}
.header span {
float: left;
font-weight: 600;
font-size: 12px
}
.tabNav {
height: 28px;
line-height: 28px;
font-size: 12px;
padding: 0 10px;
background-color: #fff;
border-radius: 6px;
position: absolute;
left: 53px;
top: 2px;
box-shadow: 0px 0px 10px #888888;
display: none;
}
.tabNav2 {
height: 28px;
line-height: 28px;
font-size: 12px;
padding: 0 10px;
background-color: #fff;
border-radius: 6px;
position: absolute;
left: -50px;
top: -30px;
box-shadow: 0px 0px 10px #888888;
display: none;
}
.pattern {
display: flex;
flex-wrap: nowrap;
justify-content: space-between;
}
.pLeft {
display: flex;
}
.pLeft>div,
.pRight {
width: 40px;
height: 40px;
line-height: 40px;
text-align: center;
}
.pLeft>div>span,
.pRight>span {
display: inline-block;
width: 12px;
height: 12px;
border: 1px solid #000;
}
#allView {
width: 40px;
height: 30px;
line-height: 30px;
text-align: center;
display: none;
}
#allView span {
display: inline-block;
width: 12px;
height: 12px;
border: 1px solid #000;
}
.Mstyle {
display: flex;
flex-wrap: nowrap;
justify-content: space-between;
height: 32px;
line-height: 32px;
font-size: 12px;
font-weight: bold;
color: #B8B8B8;
margin-bottom: 2px;
}
.Mstyle span {
width: 15.66%;
text-align: center;
}
.special {
color: #000;
}
.list {
list-style: none;
/* background-color: #333; */
width: 99%;
height: 275px;
margin: 0 auto;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
}
ul li {
/* float: left; */
width: 24.6%;
height: 19%;
margin-bottom: 1.5px;
}
button {
border: none;
width: 100%;
height: 100%;
background-color: #FAFAFA;
}
/*取消button点击的默认样式*/
button:focus {
border: 0 none;
outline: none;
}
.view {
height: 100px;
/* line-height: 100px; */
display: flex;
flex-wrap: wrap;
text-align: right;
padding-right: 10px;
}
#calculation {
font-size: 14px;
color: #777;
width: 100%;
}
#val {
font-size: 43px;
font-weight: bold;
width: 100%;
}
.btn {
background-color: #8abae0;
}
/* hover不同颜色值设置 */
.colorChange {
border: 1px solid #E6E6E6;
}
.newColor {
background-color: #F0F0F0;
}
.ortherColor {
font-weight: bold;
font-size: 18px;
}
</style>
<div class="content">
<div class="header">
<span>计算器</span>
</div>
<div class="tabNav">
保持在顶部 (Alt + Up)
</div>
<div class="tabNav2">
返回全视图 (Alt + Down)
</div>
<div class="pattern">
<div class="pLeft">
<div class="colorChange">
<span></span>
</div>
<div style="width:45px;font-size: 20px;font-weight: bold;">标准</div>
<!-- 懒得去找图片，手动画个正方形代替 -->
<div class="colorChange" id="keep">
<span></span>
</div>
</div>
<!-- 懒得去找图片，手动画个正方形代替 -->
<div class="pRight colorChange">
<span></span>
</div>
</div>
<!-- 全视图显示的操作按钮 -->
<div class="colorChange" id="allView" style="width: 40px;height:30px;line-height: 30px;text-align:center;">
<span></span>
</div>
<div class="view">
<span id="calculation"></span>
<span id='val'>0</span>
</div>
<div class="Mstyle">
<span>MC</span>
<span>MR</span>
<span class="special colorChange">M+</span>
<span class="special colorChange">M-</span>
<span class="special colorChange">MS</span>
<span>M-</span>
</div>
<ul class="list">
<li><button class="newColor">%</button></li>
<li><button class="newColor">CE</button></li>
<li><button id="c24" class="newColor">C</button></li>
<li><button class="newColor">无效</button></li>
<li><button class="newColor">1/x</button></li>
<li><button class="newColor">x²</button></li>
<li><button class="newColor">x^</button></li>
<li><button class="newColor" id="except">÷</button></li>
<li><button value="7" class="ortherColor">7</button></li>
<li><button value="8" class="ortherColor">8</button></li>
<li><button value="9" class="ortherColor">9</button></li>
<li><button id="ride" class="newColor">x</button></li>
<li><button value="4" class="ortherColor">4</button></li>
<li><button value="5" class="ortherColor">5</button></li>
<li><button value="6" class="ortherColor">6</button></li>
<li><button id="reduce" class="newColor">-</button></li>
<li><button value="1" class="ortherColor">1</button></li>
<li><button value="2" class="ortherColor">2</button></li>
<li><button value="3" class="ortherColor">3</button></li>
<li><button id="add" class="newColor">+</button></li>
<li><button style="font-size:18px;">+/-</button></li>
<li><button value="0" class="ortherColor">0</button></li>
<li><button id="spot" style="font-size: 20px;">.</button></li>
<li><button class="btn" id="equal">=</button></li>
</ul>
</div>
<script src="https://code.jquery.com/jquery-latest.min.js"></script>
<script>
// 鼠标事件
$('.colorChange').hover(function () {
console.log(window.event.clientX)
console.log(window.event.clientY)
if (this.id == 'keep') {
$('.tabNav').fadeIn(700)
} else if (this.id == 'allView') {
$('.tabNav2').fadeIn(700)
}
$(this).css('background-color', '#d7d7d7')
$(this).css('border', '1px solid #999')
}, function () {
$('.tabNav').fadeOut(100)
$('.tabNav2').fadeOut(100)
$(this).css('background-color', '#E6E6E6')
$(this).css('border', '1px solid #E6E6E6')
})
// 全视图操作
$('#allView').click(function () {
$('.header,.pattern,.Mstyle').show()
$('#allView').hide()
$('.content').css('height', '530px')
})
$("#keep").click(function () {
$('.header,.pattern,.Mstyle').hide()
$('#allView').show()
$('.content').css('height', '456px')
})
// 所有按钮的hover
$('button').hover(function () {
$(this).css('background-color', '#d7d7d7')
$(this).css('border', '1px solid #999')
}, function () {
if ($(this).attr('class') == 'newColor') {
$(this).css('background-color', '#F0F0F0')
$(this).css('border', 'none')
} else {
$(this).css('background-color', '#fff')
$(this).css('border', 'none')
}
})
// 鼠标放在等于号的事件
$(".btn").hover(function () {
$(".btn").css("background-color", "#4599db");
}, function () {
$(".btn").css("background-color", "#8abae0");
});
</script>
<script>
// 获取 dom
var listText = $('#calculation');
var inputValue = $('#val');
// 运算的第一个值
var first = 0;
// 运算的第二个值
var last = 0;
// 用来区分为第一个还是第二个赋值
var panduan = '1';
// 记录运算的符号
var sum = '';
// 记录是否为小数点状态
var isXiao = false;
// 用来阻止用户多次点击小数点
var dianNum = 0;
// 用来记录是否进行过计算
var isjisuan = false;
// 所有按钮的点击事件
$("button").click(function () {
var id = this.id
// 区分数字和运算符号
if (this.value) {
// 判断是否是经过计算后的
if (!isjisuan) {
} else {
inputValue.text(0)
listText.text(0)
// inputValue.value = 0
first = 0;
last = 0;
sum = '';
panduan = '1';
isXiao = false;
dianNum = 0;
isjisuan = false
}
// 判断是否是小数
if (isXiao) {
// 判断是否为第一个值
if (panduan == '1') {
if (first && first.indexOf('.') == -1) {
first = first + '.' + this.value
} else {
first += this.value
}
inputValue.text(Number(first))
} else {
if (last && last.indexOf('.') == -1) {
last = last + '.' + this.value
} else {
last += this.value
}
inputValue.text(Number(last))
inputValue.value = Number(last)
}
} else {
// 判断是否为第一个值
if (panduan == '1') {
first += this.value
inputValue.text(Number(first))
} else {
last += this.value
inputValue.text(Number(last))
}
}
} else {
isjisuan = false
// 判断具体是哪个运算符号的点击事件
if (id == 'equal') { // 等于事件
if (last) {
isjisuan = true
listText.text(Number(first) + sum + Number(last) + '= ')
inputValue.text(eval(Number(first) + sum + Number(last)))
} else {
inputValue.text(Number(first))
}
first = inputValue.text()
last = 0
panduan = '1';
sum = '';
} else if (id == 'add') { // 相加
operation('+')
} else if (id == 'reduce') { // 相减
// sum = '-'
operation('-')
} else if (id == 'ride') { // 相乘
// sum = '*'
operation('*')
} else if (id == 'except') { // 相除
// sum = '/'
operation('/')
} else if (id == 'spot') {
// 阻止多次点击小数点
if (dianNum >= 1) {
return
}
isXiao = true
dianNum = 1
} else if (id == 'c24') { // 清除所有的东西
inputValue.text(0)
listText.text(0)
// inputValue.value = 0
first = 0;
last = 0;
sum = '';
panduan = '1';
isXiao = false;
dianNum = 0;
isjisuan = false
}
}
})
// 用来处理多次点击运算符号的函数
function operation(sysbols) {
// 判断 值是否存在小数，若存在清一下小数点点击次数的状态
dianNum = 0
// 清一下为小数赋值的状态
isXiao = false
panduan = '2'
// 用来区分是否是连续点击运算符号
if (!last) {
listText.text(Number(first) + sysbols)
} else {
// 用来识别 储存运算符号的变量
console.log(listText.text(), '1')
first = eval(Number(first) + sum + Number(last))
last = 0
inputValue.text(first)
listText.text(first + sysbols)
}
sum = sysbols
}
</script>
