弹窗居中公式
var groupLeft = ($(window).width() - $('弹窗').width()) / 2; var groupTop = $(document).scrollTop() + ($(window).height() - $('弹窗').height()) / 2;
var groupLeft = ($(window).width() - $('弹窗').width()) / 2; var groupTop = $(document).scrollTop() + ($(window).height() - $('弹窗').height()) / 2;