title: A javascript number type question
body: <p>Why 1.toFixed(2) get syntax error while </p>
  
  <pre><code>var a = 1;
  a.toFixed(2) 
  </code></pre>
  
  <p>won't. </p>
  
  <p>Moreover, why does 1.1.toFixed(2) run alright?</p>