代码

代码路径

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

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>

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>

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
    },
});