title: alternative of setTimeout(code,millisec) api
body: <p>Is there any alternative of <code>setTimeout(callback,sleep_time_in_millisec)</code> api in js where I can use sleep time in <code>microsec</code> or <code>nanosec</code> value; </p>
  
  <p>or <code>setTimeout(callback,sleep_time_in_millisec)</code> itself is that much accurate to handle float value in sleep_time_in_millisec?</p>