phpjs/functions/math/bindec.js

php.js offers community built php functions in javascript

function bindec(binary_string) {
  //  discuss at: http://phpjs.org/functions/bindec/
  // original by: Philippe Baumann
  //   example 1: bindec('110011');
  //   returns 1: 51
  //   example 2: bindec('000110011');
  //   returns 2: 51
  //   example 3: bindec('111');
  //   returns 3: 7

  binary_string = (binary_string + '')
    .replace(/[^01]/gi, '');
  return parseInt(binary_string, 2);
}