JS實現多功能計算器
阿新 • • 發佈：2020-10-29
本文例項為大家分享了JS實現多功能計算器的具體程式碼，供大家參考，具體內容如下
1、開發語言 HTML+CSS+JavaScript
2、開發工具 Visual Studio Code
3、專案GitHub地址：計算器 (喜歡可以給一個star)
4、專案執行截圖：
5、技術分析：由於除了簡單的四則運算，還需要進行括號匹配，以及優先順序的運算。採用字尾表示式的形式進行處理，同時通過模擬棧的特點運用JS自帶的陣列進行處理。由於程式碼有詳細的註釋，所以直接上程式碼。
6、專案程式碼：
compute.html：
<!--
* @Author: CSU_XZY
* @Date: 2020-10-15 21:17:33
* @LastEditors: CSU_XZY
* @LastEditTime: 2020-10-16 22:07:08
* @FilePath: \第二天\計算器\compute.html
* @Description: just to play
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<title>計算器</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
body{
background-color: #FCFDFE;
}
.container{
overflow: hidden;
box-shadow: 0 0 3px 0 rgba(0,.3);
margin: 150px auto;
width: 548px;
height: 274px;
background-color: #fff;
}
.box{
background-color: #fcfdff;
margin: 15px auto;
overflow: hidden;
width: 514px;
height: 244px;
}
.number{
width: 514px;
height: 189px;
}
.text{
width: 514px;
height: 55px;
margin: 0;
}
span{
border-top: solid 1px #ebebeb;
border-right: solid 1px #ebebeb;
box-sizing: border-box;
float: left;
display: block;
width: 25%;
font-size: 16px;
color: #333;
background-color: #fff;
line-height: 37px;
cursor: pointer;
text-align: center;
font-weight: 10px;
}
span:hover{
background-color: #d3d7d4;
}
span:active{
background-color: #afdfe4;
}
.text>p{
text-align: right;
width: 514px;
height: 24px;
line-height: 25px;
font-size: 25px;
}
.number>div{
width: 514px;
height: 37.8px;
}
.around{
background-color: #f9f9f9;
color: #f60;
}
.compute{
color: #333;
}
.bottom{
background-color: #fff;
color: #f60;
}
.dot{
font-size: 23px;
font-weight: 19px;
}
</style>
<body>
<div class="container">
<div class="box">
<div class="text">
<p id="text"></p>
<p id="display"></p>
</div>
<div class="number">
<div class="around">
<span onclick="showDetails(this)" data-value="(" class="around">(</span>
<span onclick="showDetails(this)" data-value=")" class="around">)</span>
<span onclick="showDetails(this)" data-value="D" title="回退一位數" class="around">del</span>
<span onclick="showDetails(this)" data-value="C" class="around compute">C</span>
</div>
<div>
<span onclick="showDetails(this)" data-value="7">7</span>
<span onclick="showDetails(this)" data-value="8">8</span>
<span onclick="showDetails(this)" data-value="9">9</span>
<span onclick="showDetails(this)" data-value="÷" class="around">÷</span>
</div>
<div>
<span onclick="showDetails(this)" data-value="4">4</span>
<span onclick="showDetails(this)" data-value="5">5</span>
<span onclick="showDetails(this)" data-value="6">6</span>
<span onclick="showDetails(this)" data-value="x" class="around">x</span>
</div>
<div>
<span onclick="showDetails(this)" data-value="1">1</span>
<span onclick="showDetails(this)" data-value="2">2</span>
<span onclick="showDetails(this)" data-value="3">3</span>
<span onclick="showDetails(this)" data-value="-" class="around">-</span>
</div>
<div>
<span onclick="showDetails(this)" data-value="0">0</span>
<span onclick="showDetails(this)" data-value="." class="around bottom dot">.</span>
<span onclick="showDetails(this)" data-value="=" class="around bottom">=</span>
<span onclick="showDetails(this)" data-value="+" class="around">+</span>
</div>
</div>
</div>
</div>
</body>
<script type="text/javascript" src="compute.js"></script>
</html>compute.js:
/*
* @Author: CSU_XZY
* @Date: 2020-10-15 21:17:45
* @LastEditors: CSU_XZY
* @LastEditTime: 2020-10-17 00:04:41
* @FilePath: \第二天\計算器\compute.js
* @Description: just to play
*/
var ysf = ['+','÷','=',')','%','x','-','D'];
var sizeyunsuan = ['+','(','-'];
var isNumber = ['1','2','3','4','5','6','7','8','9','0','.'];
function showDetails(number)
{
var number = number.getAttribute("data-value");
var text = document.getElementById('display').innerText;
//回退一個文字
if(number === 'D')
{
text = text.substring(0,text.length-1);
document.getElementById('display').innerHTML=text;
return;
}
//判斷第一個數字是不是運算子
else if(judgeBegin(number) && text == "")
return;
//判斷是否是連續兩個運算子一起輸入
else if(judgeBegin(number) && judgeNext(text,number) && text[text.length-1] !== ')')
return;
//判斷第一個輸入是不是‘.'，如果是變為0.
else if(number === '.' && text == "")
number = "0.";
//如果輸入歸0，清空輸入
else if(number === 'C')
{
document.getElementById('text').innerHTML="";
document.getElementById('display').innerHTML="";
return;
}
//輸入是等號就判斷
else if(number === '=')
{
//將數字與運算子分開
let array = [];
let n = text.length;
for(let i = 0; i < n; i++)
{
var JudgeNumber = true;
let res = "";
//判斷第一個數字是否是負號
if(i===0 && text[i] === '-')
{
res+=text[i];
i++;
}
//判斷是不是在運算子之後的減號，是就變為負號
if(i !== 0 && near(array[array.length-1]) && text[i] === '-')
{
res+=text[i];
i++;
}
//判斷是否為連續的數字
while(JudgeIsNumber(text[i]) && i < n)
{
res += text[i];
i++;
JudgeNumber = false;
}
//如果不為數字了要回退一個
if(JudgeNumber === false)
i--;
//判斷其他運算子
if(JudgeNumber === true)
if(judgeBegin(text[i]) || text[i] === '(' || text[i] === '-' || text[i] === ')')
res+=text[i];
array.push(res);
}
//
console.log(array);
//中綴表示式變為字尾表示式
var hz = houZhui(array);
console.log(hz);
var result = compute(hz);
document.getElementById('text').innerHTML = text;
document.getElementById('display').innerHTML = result;
return;
}
text+=number;
document.getElementById('display').innerHTML=text;
}
//判斷是不是運算子
function judgeBegin(number)
{
for(let i = 0; i < ysf.length; i++)
{
if(ysf[i] === '-')
continue;
if(ysf[i] === number)
return true;
}
return false;
}
//判斷是否輸入兩個連續的運算子
function judgeNext(text,number)
{
if(number === '-')
return;
let a = text.length;
if(judgeBegin(text[a-1]) && judgeBegin(number))
return true;
return false;
}
//判斷輸入的字元裡面是不是數字
function JudgeIsNumber(number){
for(let i = 0; i < isNumber.length; i++)
{
if(isNumber[i] === number)
return true;
}
return false;
}
//判斷減號前面是否有別的運算子從而確定是不是負號
function near(number)
{
for(let i = 0; i < sizeyunsuan.length; i++)
{
if(sizeyunsuan[i] === number)
return true;
}
return false;
}
//中綴表示式改為字尾表示式
function houZhui(array)
{
var stack = [];
var textArea = [];
for(let i = 0; i < array.length; i++)
{
if(near(array[i]) || array[i] === ')')
{
//如果是空直接入棧
if(stack.length === 0)
stack.push(array[i]);
//如果棧頂為左括號直接入棧
else if(stack[stack.length-1] === '(' && array[i] !== ')')
stack.push(array[i]);
//如果輸入左括號直接入棧
else if(array[i] === '(')
stack.push(array[i]);
//如果輸入的是右括號
else if(array[i] === ')')
{
//一直彈出直到遇到左括號
while(stack[stack.length-1] !== '(')
{
let a = stack.pop();
textArea.push(a);
}
//彈出左括號
stack.pop();
}
else if(array[i] === '-' || array[i] === '+')
{
while(stack[stack.length-1] !== '(' && stack.length !== 0)
{
let a = stack.pop();
textArea.push(a);
}
stack.push(array[i]);
}
else if(array[i] === 'x' || array[i] === '÷')
{
while(stack[stack.length-1] !== '(' && stack[stack.length-1] !== '+' && stack[stack.length-1] !== '-' && stack.length !== 0)
{
let a = stack.pop();
textArea.push(a);
}
stack.push(array[i]);
}
}
else{
textArea.push(array[i])
}
}
while(stack.length !== 0)
{
let a = stack.pop();
textArea.push(a);
}
return textArea;
}
//計算字尾表示式
function compute(array){
var NUMBER = [];
for(let i = 0; i < array.length; i++)
{
//是運算子就計算
if(near(array[i])){
//加法
if(array[i] === '+')
{
if(NUMBER.length < 2)
return "錯誤";
else
{
let a = NUMBER.pop();
let b = NUMBER.pop();
let c = a + b;
NUMBER.push(c);
}
}
//減法
else if(array[i] === '-')
{
if(NUMBER.length < 2)
return "錯誤";
else
{
let a = NUMBER.pop();
let b = NUMBER.pop();
let c = b - a;
NUMBER.push(c);
}
}
//乘法
else if(array[i] === 'x')
{
if(NUMBER.length < 2)
return "錯誤";
else
{
let a = NUMBER.pop();
let b = NUMBER.pop();
let c = a * b;
NUMBER.push(c);
}
}
//除法
else if(array[i] === '÷')
{
if(NUMBER.length < 2)
return "錯誤";
else
{
let a = NUMBER.pop();
let b = NUMBER.pop();
if(a === 0)
return "0不能作為除數";
let c = b / a;
NUMBER.push(c);
}
}
}
else{
if(array[i][0] === '-')
{
let temp = array[i].substring(1,array[0].length);
let num = parseFloat(temp);
num = -num;
NUMBER.push(num);
}
else{
let num = parseFloat(array[i]);
NUMBER.push(num);
}
console.log(NUMBER);
}
}
if(NUMBER.length !== 1)
return "錯誤";
else
{
let b = String(NUMBER[0]);
return b;
}
}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。