可自己添加html的伪弹出框实现代码

js

var popupStatus = 0; 
//loading popup with jQuery magic! 
function loadPopup(){ 
//loads popup only if it is disabled 
if(popupStatus==0){ 
$("#backgroundPopup").css({ 
"opacity": "0.7" 
}); 
$("#backgroundPopup").fadeIn("slow"); 
$("#popupContact").fadeIn("slow"); 
popupStatus = 1; 
} 
} 
//disabling popup with jQuery magic! 
function disablePopup(){ 
//disables popup only if it is enabled 
if(popupStatus==1){ 
$("#backgroundPopup").fadeOut("slow"); 
$("#popupContact").fadeOut("slow"); 
popupStatus = 0; 
} 
} 
//centering popup 
function centerPopup(){ 
//request data for centering 
var browser=navigator.userAgent; 
var windowWidth = document.documentElement.clientWidth; 
var windowHeight = document.documentElement.clientHeight; 
var stop=""; 
var sleft=""; 
if(browser.indexOf('Chrome')!=-1){ 
stop=document.body.scrollTop; 
sleft=document.body.scrollLeft; 
} 
else{ 
stop=document.documentElement.scrollTop; 
sleft=document.documentElement.scrollLeft; 
} 
// windowWidth+=document.body.scrollLeft; 
// windowHeight+=document.body.scrollTop; 
var popupHeight = $("#popupContact").height(); 
var popupWidth = $("#popupContact").width(); 
//centering 
$("#popupContact").css({ 
"position": "absolute", 
"top": windowHeight/2-popupHeight/2+stop, 
"left": windowWidth/2-popupWidth/2+sleft 
}); 
//only need force for IE6 
//背景色 
$("#backgroundPopup").css({ 
"height": windowHeight 
}); 
} 
//调用弹出框事件 
function bb(str){ 
$("#download").show(); 
centerPopup(); 
loadPopup(); 
//CLOSING POPUP 
//Click the x event! 
$("#popupContactClose").click(function(){ 
disablePopup(); 
}); 
//Click out event!，点击背景事件 
$("#backgroundPopup").click(function(){ 
disablePopup(); 
}); 
//Press Escape event! 
$(document).keypress(function(e){ 
if(e.keyCode==27 && popupStatus==1){ 
disablePopup(); 
} 
}); 
}

html代码（默认隐藏）

<div id="download" style="display: none;"> 
<div id="popupContact"> 
<!--自己的 HTML（body中）--> 
</div> 
<div id="backgroundPopup"></div> 
</div> 
</div>