title: How do I use a mobile phone to open localhost:4200?
body: <p>My phone and pc are in same wifi. When I run <code>ng serve</code>, I open localhost:4200 in Chrome with my PC, which works.</p>
  
  <p>But I open 192.168.1.107:4200 with my mobile phone, and it doesn’t work. </p>
  
  <p>When I use <code>create-react-app</code>. It works.  </p>
  
  <p>Green is angular. White is react</p>
  
  <p><img src="https://i.stack.imgur.com/3mqZh.jpg" alt="Green is angular.White is react"></p>