javascript ImgBox透明遮罩层背景图片展示

<html> 
<head> 
<title>JavaScript Data Access Test</title> 
<script type="text/javascript"> 
function topDiv(el){ 
var elem=document.createElement("div"); 
elem.className="top-div"; 
//=========create img tag 
var img=document.createElement("img"); 
img.src=el.href; 
elem.appendChild(img); 
//=========create close DIV 
var closeDiv=document.createElement("div"); 
closeDiv.innerHTML="Close"; 
closeDiv.onclick=function(){ 
document.body.removeChild(elem); 
document.body.removeChild(alpha); 
} 
closeDiv.style.position="absolute"; 
closeDiv.style.right="2px"; 
closeDiv.style.top="2px"; 
closeDiv.style.fontSize="12px"; 
closeDiv.style.color="red"; 
closeDiv.style.border="1px solid #333"; 
closeDiv.style.backgroundColor="#eee"; 
closeDiv.style.cursor="hand"; 
elem.appendChild(closeDiv); 
//=========append the top DIV to body 
document.body.appendChild(elem); 
var alpha = alphaDiv(elem); 
}

function alphaDiv(el){ 
var elem=document.createElement("div"); 
elem.className="alphaDiv"; 
elem.onclick=function(e){ 
document.body.removeChild(elem); 
document.body.removeChild(el); 
} 
document.body.appendChild(elem); 
return elem; 
}

onload=function(){ 
var links=document.getElementsByTagName("a"); 
for(var i=0,len=links.length;i<len;i++){ 
if(links[i].rel=="Imgbox"){ 
links[i].onclick=function(){ 
topDiv(this); 
return false; 
} 
} 
} 
} 
</script> 
<style> 
.alphaDiv{ 
z-index:100; 
width:100%; 
height:100%; 
opacity:0.5; 
background:#666666; 
top:0; 
left:0; 
position:absolute; 
filter:alpha(opacity=50); 
} 
.top-div{ 
z-index:101; 
border:1px solid #333; 
padding:2px; 
background:#eee; 
position:absolute; 
} 
a{ 
outline:none; 
}

</style> 
</head> 
<body class="body"> 
<p>Click here to show the pic one.<br> 
Click here to show the pic two.<br>
Click me 
</p> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

注意上面的图片地址，大家自己

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