[js学习笔记]bootstrap中模态对话框水平垂直居中

      that.$element
        .addClass('in')
        .attr('aria-hidden', false)

      that.enforceFocus()
/***************************************************************/
var $modalDialog = that.$element.find(".modal-dialog"),
          dialogHeight = $modalDialog.height(),
          windowHeight = $(window).height();

// When dialog height greater than window height,
// use default margin top value to set dialog position.
// if (windowHeight < dialogHeight) {
// do nothing
// return;
// }

// When dialog height less than window height,
// use margin top set it position.
// Dialog position set it with vertical center.
if (windowHeight > dialogHeight) {
          $modalDialog.css({
"marginTop": ( windowHeight - dialogHeight) / 2
          });
      }

/**************************************************************/
var e = $.Event('shown.bs.modal', { relatedTarget: _relatedTarget })

块级注释间为增加代码，在bootstrap.js中
https://my.oschina.net/jak/blog/387693

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以下为天堂向左补充
对于bootstrap 3.3.5版本，注意这一行的 that
that.enforceFocus()
在bootstrap.min.js中可能需要将 that 换成 d：