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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div id="app">
  
  <h1>数字当てゲーム</h1>
  <p>
    選んだ数字とランダム数字が一致すると選んだ数字をポイントに加算。<br>
    はずれると選んだ数字の分、ポイントが減ります。<br>
  </p>
  
  <div v-if="limit != 0">
    <dl :class="{ 'is-correct': result, 'is-incorrect': result === false }">
      <dt class="random">{{ random }}</dt>
      <dd>
        <button @click="sum(1)">1</button>
        <button @click="sum(2)">2</button>
        <button @click="sum(3)">3</button>
      </dd>
    </dl>
        
    <p>ボタンを押せるのはあと{{ limit }}回です</p>
  </div>
  <dl>
    <dt>あなたのポイント</dt>
    <dd class="point" :class="{'is-minus':point < 0}">{{ point }}</dd>
  </dl>
  
  <button v-if="limit == 0" @click="reset">リセット</button>
</div>
!

CSS 

              
                
body{
  text-align:center;
}
.random{
  font-size: 3em;
}

.point{
  font-size: 3em;
  line-height:1;
  margin-top:0;
}

dl{
  border:4px solid #ddd;
  padding: 10px;
  width:240px;
  margin: 1em auto;
  &.is-correct{
    border-color: blue;
    color: blue;
  }
  &.is-incorrect{
    border-color: red;
    color: red;
  }
}
dd{
  margin:0;
  font-weight:bold;
}

.is-minus{
  color:red;
}
!

JS 

              
                var app = new Vue({
  el: '#app',
  data: {
    random: '?',
    min: 1,
    max: 3,
    point: 0,
    limit: 10,
    result: ''
  },
  methods:{
   sum: function(el){
     //ランダムで整数を出す
      this.random = Math.floor( Math.random() * (this.max + 1 - this.min) ) + this.min ;
     //ランダム数字と比較
     if(el == this.random){
       this.point += el;
       this.result = true;
     }else{
        this.point -= el;
        this.result = false;
     }
     //回数のカウントダウン
     this.limit -= 1;
   },
    reset: function(){
      this.limit = 10;
      this.point = 0;
      this.random = '?';
      this.result = '';
    }
  }
});
!
999px

Console