title: How to implement "import" syntax in ES6 in ES5
body: <p>All:</p>
  
  <p>I have never learnt ES6 before, but when I tried React Router, the guide is almost written in ES6, and there is a part using 'import A from b', after looking it up, it turns out that that is ES6 syntax, I wonder how can I implement this with ES5? Is this just a simplely using:</p>
  
  <pre><code>var A = require("b");
  </code></pre>
  
  <p>Thanks</p>