Vue 2.0 Hello World

HTML

<script src="https://unpkg.com/vue"></script>

<div id="app">
  <p>{{userAgent}}</p>
  <p>{{userOs}}</p>
</div>

JavaScript

let vapp = new Vue({
  el: '#app',
  data: {
    userAgent:"",
    userOs:""
	},
  mounted() {
    console.log('userAgent; ',navigator.userAgent);
    
    this.userAgent = navigator.userAgent || '';
    this.userOs = navigator.platform || '';
    
    let osType = this.userOs.toLowerCase();

    if(osType.includes('win')) alert('win');
    else if(osType.includes('mac')) alert('mac');
    else if(osType.includes('ios')) alert('ios');
    else if(osType.includes('android')) alert('android');
    else if(osType.includes('linux')) alert('linux');
    else  alert('unkown os');
    
  },
});