防止WordPress站点被别人通过iframe框架引用

// Break Out of Frames for WordPress
function break_out_of_frames() {
     if (!is_preview()) {
          echo "n<script type="text/javascript">";
          echo "n<!--";
          echo "nif (parent.frames.length > 0) { parent.location.href = location.href; }";
          echo "n-->";
          echo "n</script>nn";
     }
}
add_action('wp_head', 'break_out_of_frames');