function (btn) {
var cloneDom = $("<div class='allPopModal'><div class='allModalZhezhao'></div></div>");
cloneDom.append($(btn))
$("body").append(cloneDom)
$(btn).css("margin", "0 auto")
$(btn).show()
var left = ($("body")[0].offsetWidth - $(btn)[0].offsetWidth) / 2;
var marginTop = ($("body")[0].offsetHeight - $(btn)[0].offsetHeight) / 2;
$(btn).css("margin-top", marginTop + "px")
$(btn).css("left", left + "px")
标签：body,打开,窗口,var,cloneDom,btn,css,left From： https://www.cnblogs.com/Ma-YuHao/p/16711617.html