bootstarpmodal框居中显示的实现代码

this.$element.css({
   paddingLeft: !this.bodyIsOverflowing && modalIsOverflowing &＃63; this.scrollbarWidth : '',
   paddingRight: this.bodyIsOverflowing && !modalIsOverflowing &＃63; this.scrollbarWidth : ''
})

 // 是弹出框居中
  var $modal_dialog = $(this.$element[0]).find('.modal-dialog');
  var m_top = ( $(window).height() - $modal_dialog.height() )/2;
  $modal_dialog.css({'margin': m_top + 'px auto'});
 }