使用jquery能获取隐藏元素的宽高

//使用jquery能获取隐藏元素的宽高，获取方法$(元素).actual('width')
;(function ($) {
  $.fn.addBack = $.fn.addBack || $.fn.andSelf;

  $.fn.extend({

    actual: function (method, options) {
      // check if the jQuery method exist
      if (!this[method]) {
        throw '$.actual => The jQuery method "' + method + '" you called does not exist';
      }
      var defaults = {
        absolute: false,
        clone: false,
        includeMargin: false
      };

      var configs = $.extend(defaults, options);
      var $target = this.eq(0);
      var fix, restore;
      if (configs.clone === true) {
        fix = function () {
          var style = 'position: absolute !important; top: -1000 !important; ';

          // this is useful with css3pie
          $target = $target.
          clone().
          attr('style', style).
          appendTo('body');
        };

        restore = function () {
          // remove DOM element after getting the width
          $target.remove();
        };
      } else {
        var tmp = [];
        var style = '';
        var $hidden;

        fix = function () {
          // get all hidden parents
          $hidden = $target.parents().addBack().filter(':hidden');
          style += 'visibility: hidden !important; display: block !important; ';

          if (configs.absolute === true) style += 'position: absolute !important; ';

          // save the origin style props
          // set the hidden el css to be got the actual value later
          $hidden.each(function () {
            var $this = $(this);

            // Save original style. If no style was set, attr() returns undefined
            tmp.push($this.attr('style'));
            $this.attr('style', style);
          });
        };

        restore = function () {
          // restore origin style values
          $hidden.each(function (i) {
            var $this = $(this);
            var _tmp = tmp[i];

            if (_tmp === undefined) {
              $this.removeAttr('style');
            } else {
              $this.attr('style', _tmp);
            }
          });
        };
      }

      fix();
      // get the actual value with user specific methed
      // it can be 'width', 'height', 'outerWidth', 'innerWidth'... etc
      // configs.includeMargin only works for 'outerWidth' and 'outerHeight'
      var actual = /(outer)/.test(method) ?
        $target[method](configs.includeMargin) :
        $target[method]();

      restore();
      // IMPORTANT, this plugin only return the value of the first element
      return actual;
    }
  });
})(jQuery);