title: How base option works in vue-router
body: <p>As par <a href="https://router.vuejs.org/en/api/options.html" rel="noreferrer">documentation</a> of base option:</p>
  
  <blockquote>
    <p>The base URL of the app. For example, if the entire single page application is served under /app/, then base should use the value "/app/".</p>
  </blockquote>
  
  <p>But I have tried it like following, It does not seems to work:</p>
  
  <pre><code>const router = new VueRouter({
    base: "/app/",
    routes
  })
  </code></pre>
  
  <p>Demo <a href="http://jsfiddle.net/xgrjzsup/1352/" rel="noreferrer">fiddle</a>.</p>