HarmonyOS简易计算器
前言
计算器是我们生活中经常使用的应用，此项目是基于Harmony实现的简易计算器，计算器的键盘，等后续组件完善了在做优化，目前 grid 适合一些均衡布局，通过监听计算符号添加判断逻辑，计算结果也是通过添加的计算类型进行计算，目前支持一级计算，后面做连续计算。
代码解析
子组件：
1，hml 文件
实用了四个 for 循环实现了键盘效果
<div class="container"> <text class="input-content">{{inputcontent}}</text> <div class="menu-content"> <div class="caluater" for="{{ caluater }}" > <button class="content" onclick="calculatorClick({{ $item.id }})">{{ $item.id }}</button> </div> </div> <div class="menu-content"> <div class="caluater" for="{{ caluater1 }}"> <button class="content2" on:click="calculatorClick({{ $item.id }})">{{ $item.id }}</button> </div> </div> <div class="menu-content"> <div class="caluater" for="{{ caluater2 }}"> <button class="content2" on:click="calculatorClick({{ $item.id }})">{{ $item.id }}</button> </div> </div> <div class="list2-content"> <div class="list3-content"> <div class="list2-content"> <div class="caluater" for="{{ caluater3 }}"> <button class="content2" on:click="calculatorClick({{ $item.id }})">{{ $item.id }}</button> </div> </div> <div class="list2-content"> <div class="caluater" for="{{ caluater4 }}"> <button class="content2" on:click="calculatorClick({{ $item.id }})">{{ $item.id }}</button> </div> </div> </div> <button class="equals" onclick="calculatorResult">=</button> </div></div>2，css 文件
样式比较简单，主要控制键盘和表达式文本的颜色和大小
.container { flex-direction: column; justify-content: flex-end; align-items: flex-end; width: 100%;}.input-content{ background-color: #00ffffff; text-align: right; font-size: 25px; padding: 10px; font-weight: bold;}.menu-content{ width: 100%; background-color: brown; allow-scale: true;}.caluater { flex-direction: row; width: 100%; height: 70px; background-color: #00ffffff; margin-left: 5px; margin-right: 5px; margin-top: 10px;}.content{ font-size: 30px; font-weight: bold; radius: 10px; width: 100%; height: 100%; text-color: #007EFF; background-color: #A8CCFB;}.content2{ font-size: 30px; font-weight: bold; radius: 10px; width: 100%; height: 100%; text-color: #000000; background-color: #dddcdc;}.list2-content{ flex-direction: row; justify-content: center; align-items: center; background-color: brown;}.list3-content{ flex-direction: column; margin-bottom: 10px;}.equals{ width: 30%; height: 150px; font-size: 30px; font-weight: bold; radius: 10px; margin-left: 5px; margin-right: 5px;}3，js 文件
js 中主要实现逻辑，请看具体计算的判断。
import prompt from '@system.prompt';export default { data: { title: "", inputcontent: "", number1: "", number2: "", type: "", caluater: [ { 'id': "C", }, { 'id': "÷", }, { 'id': "×", }, { 'id': "←", } ], caluater1:[ { 'id': "7", }, { 'id': "8", }, { 'id': "9", }, { 'id': "+", } ], caluater2:[ { 'id': "4", }, { 'id': "5", }, { 'id': "6", }, { 'id': "-", } ], caluater3:[ { 'id': "1", }, { 'id': "2", }, { 'id': "3", } ], caluater4:[ { 'id': "%", }, { 'id': "0", }, { 'id': ".", } ] }, onInit() { }, calculatorClick(result){ this.inputcontent = this.inputcontent+""; let str = this.inputcontent .substring(this.inputcontent.length-1, this.inputcontent.length);switch(result) { case "←": if(this.inputcontent.length > 0) { let str = this.inputcontent .substring(0, this.inputcontent.length - 1); this.inputcontent = str; } break; case "C": this.inputcontent = ""; break; case "+": this.calcula(str,result,"+"); break;case "-": this.calcula(str,result,"-"); break;case "×": this.calcula(str,result,"×"); break;case "÷": this.calcula(str,result,"÷"); break;case ".": if(this.inputcontent.length > 0 && str != ".") { this.inputcontent += result; } break; default: this.inputcontent += result; break; } }, calcula(str,result,cla){ if(this.inputcontent.length > 0 && str != "+" && str != "-" && str != "×" && str != "÷") { this.type = cla; this.inputcontent += result; } else { this.calculatorResult(); } }, calculatorResult(){// 计算结果 var temp = this.inputcontent.split(this.type); console.log("this.inputcontent = "+this.inputcontent) let str = this.inputcontent .substring(this.inputcontent.length-1, this.inputcontent.length); console.log("this.type = "+this.type) if (this.type == "+") { // 加法计算 if(temp.length > 1) { console.log("temp = "+temp) var num1 = parseFloat(temp[0]); var num2 = parseFloat(temp[1]); console.log("num1 = "+num1) console.log("num2 = "+num2) console.log("str = "+str) if(str != "+") { this.inputcontent = num1 + num2; this.type = ""; } } } else if(this.type == "-") { // 减法计算 if(temp.length > 1) { var num1 = parseFloat(temp[0]); var num2 = parseFloat(temp[1]); if(str != "-") { this.inputcontent = num1 - num2; this.type = ""; } } } else if(this.type == "×") { // 乘法计算 if(temp.length > 1) { var num1 = parseFloat(temp[0]); var num2 = parseFloat(temp[1]); if(str != "×") { this.inputcontent = num1 * num2; this.type = ""; } } } else if(this.type == "÷") { // 除法计算 if(temp.length > 1) { var num1 = parseFloat(temp[0]); var num2 = parseFloat(temp[1]); if(str != "÷") { this.inputcontent = num1 / num2; this.type = ""; } } } }}