注：功能并不完整，主要练习vue3的书写方式

<template>
  <h3 class="title">计算器</h3>
  <div class="MyComputed">
    <div class="result">
      <div class="text">
        <el-tag type="" v-model="result">{{ result }}</el-tag>
      </div>
    </div>
    <div class="control">
      <el-row>
        <el-button type="primary" @click="getButtonNumber($event)" round value="7">7</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="8">8</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="9">9</el-button>
        <el-button type="primary" @click="add($event)" value="+" round>+</el-button>
      </el-row>
      <el-row>
        <el-button type="primary" @click="getButtonNumber($event)" round value="4">4</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="5">5</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="6">6</el-button>
        <el-button type="primary" @click="sub($event)" round>-</el-button>
      </el-row>
      <el-row>
        <el-button type="primary" @click="getButtonNumber($event)" round value="1">1</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="2">2</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" round value="3">3</el-button>
        <el-button type="primary" @click="multiply($event)" round value="*">*</el-button>
      </el-row>
      <el-row>
        <el-button type="primary" @click="clear" round>C</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" value="0" round>0</el-button>
        <el-button type="primary" @click="getButtonNumber($event)" value="." round>.</el-button>
        <el-button type="primary" @click="equal" round>=</el-button>
      </el-row>
    </div>
  </div>
</template>

<script>
import { ref } from "vue";
export default {
  name: "Vue3TestHome",
  setup() {
    let result = ref(0);

    function getButtonNumber(e) {
      // 拿到绑定的值
      // console.log(e.currentTarget.value);
      let value = e.currentTarget.value;
      result.value = result.value + value;
    }

    // 加法
    function add(e) {
      let add = e.currentTarget.value;
      result.value = result.value + add;
    }
    // 减法
    function sub(e) {
      let add = e.currentTarget.value;
      result.value = result.value + add;
    }
    // 乘法
    function multiply(e) {
      let add = e.currentTarget.value;
      result.value = result.value + add;
    }
    // 清除
    function clear() {
      result.value = 0;
    }

    // 等于
    function equal() {
      console.log("======");
      if (result.value.includes("+")) {
        let value = result.value.split("+");
        // console.log(value);
        result.value = Number(value[0]) + Number(value[1]);
      }
      if (result.value.includes("-")) {
        let value = result.value.split("-");
        // console.log(value);
        result.value = Number(value[0]) - Number(value[1]);
      }
      if (result.value.includes("*")) {
        let value = result.value.split("*");
        // console.log(value);
        result.value = Number(value[0]) * Number(value[1]);
      }
    }

    return {
      result,
      getButtonNumber,
      add,
      sub,
      multiply,
      clear,
      equal,
    };
  },
};
</script>

<style lang="scss" scoped>