div弹窗

<style>
.black_overlay{
display: none;
position: absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: black;
z-index:1001;
-moz-opacity: 0.8;
opacity:.80;
filter: alpha(opacity=88);
}
.white_content {
display: none;
position: absolute;
top: 15%;
left: 30%;
width: 25%;
height: 70%;
padding: 5px;
border: 0px solid orange;
background-color: white;
z-index:1002;
overflow: auto;
}
</style>

<a href = "#" onclick="document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'">打开</a>

<div id="light" class="white_content">
<a href = "#" onclick = "document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">关闭</a>
</div>

<div id="fade" class="black_overlay"></div>