iOS orientation change scale fix

gistfile1.js

(function(doc) {
  var addEvent  = 'addEventListener',
      type      = 'gesturestart',
      qsa       = 'querySelectorAll',
      scales    = [1, 1],
      meta      = qsa in doc ? doc[qsa]('meta[name=viewport]') : [],
      fix       = function() {
        meta.content = 'width=device-width,minimum-scale=' + scales[0] + ',maximum-scale=' + scales[1];
        doc.removeEventListener(type, fix, true);
      };
  
  if ((meta = meta[meta.length - 1]) && addEvent in doc) {
    fix();
    scales = [.25, 1.6];
    doc[addEvent](type, fix, true);
  }
}(document));