<div id="article_content" class="article_content clearfix"> <div id="content_views" class="htmledit_views"> 非常简单就实现了,代码不用解释,很容易懂的 //request data for centering var windowWidth = document.documentElement.clientWidth; var windowHeight = document.documentElement.clientHeight; var popupHeight = $("#popupContact").height(); var popupWidth = $("#popupContact").width(); //centering $("#popupContact").css({ "position": "absolute", "top": windowHeight/2-popupHeight/2, "left": windowWidth/2-popupWidth/2 }); div> div> <div id="treeSkill">div>