YUI 之getLocation

关于Y.getLocation的简介是

Returns the `location` object from the window/frame in which this YUI instance operates, or `undefined` when executing in a non-browser environment

意思就是从window/frame中的YUI实例运行时，或者没有浏览器环境下，返回一个Location对象，原因是低版本的chrome和safafi会有一个Bug存在

[WebKit Bug 34679](https://bugs.webkit.org/show_bug.cgi?id=34679)

当你在一个

(function(window){

  // A convenient shortcut.
  var win_loc = window.location,
    loc = location,
    state;

  (function loopy(){
    console.log([
      'win_loc.href: ' + typeof win_loc.href,
      'loc.href: ' + typeof loc.href,
      'location.href: ' + typeof location.href,
      'window.location.href: ' + typeof window.location.href
    ].join(', '));
    timeout_id = setTimeout( loopy, 1000 );
  })();

})(this);

当我们再随意点击一个链接后，通过后退再次返回这个函数所存在的页面时，在safari（5.1.7）中，前两个变成了undefined，

测试地址http://benalman.com/code/projects/jquery-hashchange/examples/bug-safari-back-from-diff-domain/

YUI的解决方案

Y.getLocation = function(){
  var win = Y.config.win;
  return win & win.location;
}