title: Pure Javascript listen to input value change
body: <p>Is there any way I can create a constant function that listens to an input, so when that input value changes, something is triggered immediately?</p>
  
  <p>I am looking for something using pure javascript, no plugins, no frameworks and I can't edit the HTML.</p>
  
  <p>Something, for example: </p>
  
  <p><strong>When I change the value in the input <code>MyObject</code>, this function runs.</strong></p>
  
  <p>Any help?</p>