实验1 Vue3项目案例——简易计算器

实验 Vue3项目案例——简易计算器

一、任务目标：掌握vue3的常用组件与事件处理
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二、实验步骤

1、创建一个项目calculator

npm init vue@latest

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2、删除src/components文件夹下所有文件

3、在src/components文件夹下新建Calculator.vue（TS版本）

<template>
  <div id="box">
    <h1>计算器</h1>
    <input type="text" v-model="num1" />
    <select v-model="op">
      <option value="0">+</option>
      <option value="1">-</option>
      <option value="2">*</option>
      <option value="3">/</option>
    </select>
    <input type="text" v-model="num2" />
    <button v-on:click="calculate">=</button>
    <span id="span">{{ result }}</span>
  </div>
</template>

<script setup lang="ts">
import { ref } from "vue";
let num1 = ref(0);
let num2 = ref(0);
let result = ref(0);
let op = ref(0);

function calculate() {
  if (op.value == 0) {
    result.value = Number(num1.value) + Number(num2.value);
  } else if (op.value == 1) {
    result.value = Number(num1.value) - Number(num2.value);
  } else if (op.value == 2) {
    result.value = Number(num1.value) * Number(num2.value);
  } else if (op.value == 3) {
    result.value = Number(num1.value) / Number(num2.value);
  }
}
</script>

4、在src/components文件夹下新建Calculator.vue（JS版本）

<template>
    <div id="box">
      <h1>计算器</h1>
      <input type="text" v-model="num1"  @keyup.enter="calculate" />
      <select v-model="op">
        <option value="0">+</option>
        <option value="1">-</option>
        <option value="2">*</option>
        <option value="3">/</option>
      </select>
      <input type="text" v-model="num2"  @keyup.enter="calculate" />
      <button v-on:click="calculate">=</button>
      <span id="span">{{ result }}</span>
    </div>
  </template>
  
  <script setup lang="ts">
  import { ref } from "vue";
  let num1 = ref(0);
  let num2 = ref(0);
  let result = ref(0);
  let op = ref(0);
  
  function calculate() {
    if (op.value == 0) {
      result.value = Number(num1.value) + Number(num2.value);
    } else if (op.value == 1) {
      result.value = Number(num1.value) - Number(num2.value);
    } else if (op.value == 2) {
      result.value = Number(num1.value) * Number(num2.value);
    } else if (op.value == 3) {
      result.value = Number(num1.value) / Number(num2.value);
    }
  }
  </script>
  <style>
  *{
    font-size: 24px;
  }
  input{
    outline-style: none ;
    border: 1px solid #ccc; 
    border-radius: 3px;
    padding: 14px 14px;
    width: 200px;
    font-size: 24px;
}
select, button{
    outline-style: none ;
    border: 1px solid #ccc; 
    border-radius: 3px;
    padding: 14px 14px;
    width: 100px;
    font-size: 24px;
    background-color: aqua;
    margin: 10px;
}
  </style>

5、修改App.vue

<script setup>
import Calculator from "./components/Calculator.vue";
</script>


<template>
    <Calculator />
</template>

6、修改main.js

import { createApp } from 'vue'
import App from './App.vue'


createApp(App).mount('#app')

7、修改index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>简易计算器</title>
  </head>
  <body>
    <div id="app"></div>
    <script type="module" src="/src/main.js"></script>
  </body>
</html>

8、运行项目

cd calculator
npm install
npm run dev

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