JQuery实现遮罩效果

$.fn.dialog=function(){ this.MaskDiv=function() { var wnd = $(window), doc = $(document); //alert(doc.height()); if(wnd.height() > doc.height()){ //当高度少于一屏 wHeight = wnd.height(); }else{//当高度大于一屏 wHeight = doc.height(); } //创建遮罩背景 $("body").append("<div ID=MaskID></div>"); $("body").find("#MaskID").width(wnd.width()).height(wHeight) .css({position:"absolute",top:"0px",left:"0px",background:"#ccc",filter:"Alpha(opacity=90);",opacity:"0.3",zIndex:"10000"}); } }