src求和案例纯Vue版本

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# 代码

# `代码路径`

$ tree -N
.
├── App.vue
├── components
│   └── Count.vue
└── main.js

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# `App.vue`

<template>
  <div>
    <Count></Count>
  </div>
</template>

<script>
import Count from "./components/Count.vue";
export default {
  name: "App",
  components: { Count },
};
</script>

<style>
.container,
.game,
h4 {
  display: flex;
  justify-content: space-around;
}
</style>

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# `Count.vue`

<template>
  <div>
    <h1>当前的和为：{{ sum }}</h1>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
export default {
  name: "Count",
  data() {
    return {
      n: 1, // 用户选择的数字
      sum: 0, // 当前的和
    };
  },
  methods: {
    increment() {
      this.sum += this.n;
    },
    decrement() {
      this.sum -= this.n;
    },
    incrementOdd() {
      if (this.sum % 2) {
        this.sum += this.n;
      }
    },
    incrementWait() {
      setTimeout(() => {
        this.sum += this.n;
      }, 500);
    },
  },
};
</script>

<style>
select,
button {
  margin-right: 5px;
}
</style>

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# `main.js`

import Vue from "vue";
import App from "./App.vue";

Vue.config.productionTip = false;

new Vue({
  el: "#app",
  components: { App },
  render: (h) => h(App),
  beforeCreate() {
    Vue.prototype.$bus = this;
  },
});