Vue

by apasaja

HTML

<div id="app">
    {{ message[0] }}
    <button @click="change">Change</button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: '#app',
  data: {
    message: [45,35,50]
  },
  methods: {
    change() {
      this.$set(this.message, 0, 12);                    
      //message[0] = 35;
      console.log(this.message);
    }
  }
});