Milliseconds conversion utility.

ms.js

/**

# ms.js

No more painful `setTimeout(fn, 60 * 4 * 3 * 2 * 1 * Infinity * NaN * '☃')`.

    ms('2d')      // 172800000
    ms('1.5h')    // 5400000
    ms('1h')      // 3600000
    ms('1m')      // 60000
    ms('5s')      // 5000
    ms('500ms')   // 500
    ms('100')     // 100
    ms(100)       // 100

**/

!function (g) {
  var r = /(\d*.?\d+)([mshd]+)/
    , _ = {}
    , m;

  _.ms = 1;
  _.s = 1000;
  _.m = _.s * 60;
  _.h = _.m * 60;
  _.d = _.h * 24;

  function ms (s) {
    return +s || ((m = r.exec(s.toLowerCase())) ? m[1] * _[m[2]] : NaN);
  }

  g.top ? g.ms = ms : module.exports = ms;
}(this);