求和案例vue版

首先需要做的效果：

 

 　　静态样式

 <div id="app">
      <h1>当前总数为:{{nbr}}</h1>
          <select  v-model.number="n">
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
          </select>
      <button @click="add">+</button>
      <button @click="subtract">-</button>
      <button @click="odd">为奇数再加</button>
      <button @click="item">等一等再加</button>
  </div>

js部分

data(){
            return{
                n:1,
                nbr:0,
            }
        },
        methods:{
            add(){
                this.nbr += this.n
                console.log('App',this);
            },
            subtract(){
                this.nbr -=this.n
            },
            odd(){
                console.log(this.nbr);
                if (this.nbr % 2 ==1) {
                    this.nbr += this.n
                } 
            },
            item(){
                 setTimeout(()=>{
                            this.nbr += this.n
                            console.log(this.nbr);
                        // 时间间隔
            },1500);
            }
        },

css部分

<style lang="less" scoped>
    button{
        margin-left: 5px;
    }
</style>