js实现防止被iframe的方法

<script>
// Break out of an iframe, if someone shoves your site
// into one of those silly -bar URL shortener things.
//
// Passing `this` and re-aliasing as `window` ensures
// that the window object hasn't been overwritten.
//
// Example:
//  var window = 'haha, punked!';
//
// Note: Probably unnecessary, but just for kicks.
(function(window) {
 if (window.location !== window..location) {
  window..location = window.location;
 }
})(this);
</script>

<script>
// A more cryptic one-liner, to awe & impress.
//
// No need to protect `window` since `this` is
// immutable, and at the most level means
// `window` anyways. Here, we pare locations
// on the left side of the "&&" and execute the
// code in parenthesis if that condition is
// true ( location isn't iframe location).
//
// Otherwise, nothing happens. It's basically an
// if statement without wrapping curly brackets.
//
// Weird, I know. But pretty cool, right? :)
this..location !== this.location && (this..location = this.location);
</script>