phpjs/functions/array/array_product.js

php.js offers community built php functions in javascript

function array_product(input) {
  // From: http://phpjs.org/functions
  // +   original by: Waldo Malqui Silva
  // *     example 1: array_product([ 2, 4, 6, 8 ]);
  // *     returns 1: 384
  var idx = 0,
      product = 1,
      il = 0;

  if (Object.prototype.toString.call(input) !== '[object Array]') {
    return null;
  }

  il = input.length;
  while (idx < il) {
    product *= (!isNaN(input[idx]) ? input[idx] : 0);
    idx++;
  }
  return product;
}