JS實現(xiàn)多功能計算器
本文實例為大家分享了JS實現(xiàn)多功能計算器的具體代碼,供大家參考,具體內(nèi)容如下
1、開發(fā)語言 HTML+CSS+JavaScript
2、開發(fā)工具 Visual Studio Code
3、項目GitHub地址:計算器 (喜歡可以給一個star)
4、項目運(yùn)行截圖:
5、技術(shù)分析:由于除了簡單的四則運(yùn)算,還需要進(jìn)行括號匹配,以及優(yōu)先級的運(yùn)算。采用后綴表達(dá)式的形式進(jìn)行處理,同時通過模擬棧的特點運(yùn)用JS自帶的數(shù)組進(jìn)行處理。由于代碼有詳細(xì)的注釋,所以直接上代碼。
6、項目代碼:
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, 0, 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(shù)" 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 = ['+','÷','(','x','-']; 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(shù)字是不是運(yùn)算符 else if(judgeBegin(number) && text == "") return; //判斷是否是連續(xù)兩個運(yùn)算符一起輸入 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?yōu)?. 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(shù)字與運(yùn)算符分開 let array = []; let n = text.length; for(let i = 0; i < n; i++) { var JudgeNumber = true; let res = ""; //判斷第一個數(shù)字是否是負(fù)號 if(i===0 && text[i] === '-') { res+=text[i]; i++; } //判斷是不是在運(yùn)算符之后的減號,是就變?yōu)樨?fù)號 if(i !== 0 && near(array[array.length-1]) && text[i] === '-') { res+=text[i]; i++; } //判斷是否為連續(xù)的數(shù)字 while(JudgeIsNumber(text[i]) && i < n) { res += text[i]; i++; JudgeNumber = false; } //如果不為數(shù)字了要回退一個 if(JudgeNumber === false) i--; //判斷其他運(yùn)算符 if(JudgeNumber === true) if(judgeBegin(text[i]) || text[i] === '(' || text[i] === '-' || text[i] === ')') res+=text[i]; array.push(res); } // console.log(array); //中綴表達(dá)式變?yōu)楹缶Y表達(dá)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(yùn)算符 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(xù)的運(yùn)算符 function judgeNext(text,number) { if(number === '-') return; let a = text.length; if(judgeBegin(text[a-1]) && judgeBegin(number)) return true; return false; } //判斷輸入的字符里面是不是數(shù)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(yùn)算符從而確定是不是負(fù)號 function near(number) { for(let i = 0; i < sizeyunsuan.length; i++) { if(sizeyunsuan[i] === number) return true; } return false; } //中綴表達(dá)式改為后綴表達(dá)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; } //計算后綴表達(dá)式 function compute(array){ var NUMBER = []; for(let i = 0; i < array.length; i++) { //是運(yùn)算符就計算 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(shù)"; 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(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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