问如何检查div的高度以重新排列div块

EN

$(function(){
  // Bind the resize event. When any test element's size changes, update its
  // corresponding info div.
  var iframe = $(".fb_iframe_widget");

  // Called once the Iframe's content is loaded.
  iframe.load(function(){
    // The Iframe's child page BODY element.
    var iframe_content = iframe.contents().find('body');

    // Bind the resize event. When the iframe's size changes, update its height as
    // well as the corresponding info div.
    iframe_content.resize(function(){
      var elem = $(this);

      // Resize the IFrame.
      iframe.css({ height: elem.outerHeight( true ) });

      $('#sort').masonry(reloadItems);

    // Resize the Iframe and update the info div immediately.
    iframe_content.resize();
  });
});