title: JS how to know which function is called when i click a button element
body: <p>For example, I have an html snippet:<br></p>
  
  <pre><code>&lt;input id="aps123456" class="bt-sb bt-blue" type="button"&gt;
  </code></pre>
  
  <p>If I clicked the button, the button will trigger a function to do some procedure, maybe submit a form. But I don't know which function is called. Because there're too many minified scripts in a file. I wonder if there's a way to locate this function precisely.</p>