Touch screen InactivityTimer

file1.js

function InactivityTimer() {
     this.timer = 0;
     this.threshold = 5000;

     window.addEventListener('click', this.resetTimer.bind(this), true); // binding to capture phase

     this.startTimer.call(this);
}
InactivityTimer.prototype = {
     startTimer: function() {
          this.timer = setTimeout(this.resetContent.bind(this), this.threshold);
     },
     resetTimer: function() {
          clearTimeout(this.timer);
          this.startTimer.call(this);
     },
     resetContent: function() {
          clearTimeout(this.timer);

          // do your reset stuff here
     }
};