phpjs/functions/math/exp.js

php.js offers community built php functions in javascript

function exp(arg) {
  //  discuss at: http://phpjs.org/functions/exp/
  // original by: Onno Marsman
  //   example 1: exp(0.3);
  //   returns 1: 1.3498588075760032

  return Math.exp(arg);
}