遮罩层点击按钮弹出并且具有拖动和关闭效果（两种方法）
作者：1565783227
实现点击按钮弹出遮罩层，点击按钮可以随意拖动和关闭。接下来，通过本篇文章给大家介绍遮罩层点击按钮弹出并且具有拖动和关闭效果，需要的朋友可以参考下
首先给大家展示演示效果：
基于JavaScript的网页弹出层，鼠标按在弹出层的标题栏处，可以拖动该浮动层随意移动位置，不需要时也可以关闭，操作体验舒服，兼容性好，IE/火狐等众多浏览器下运行稳定、反应快速。代码表现方面，简洁务实，不玩虚的，拿去学习也相当不错。
js代码
示例一：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>弹出层并可拖拽</title>
<style>
html,body{height:100%;overflow:hidden;}
body,div,h2{margin:0;padding:0;}
body{font:12px/1.5 Tahoma;}
li{ list-style-type:none}
center{padding-top:10px;}
button{cursor:pointer;}
#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;}
#win{position:absolute;top:50%;left:50%;width:400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;}
h2{font-size:12px;height:18px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;cursor:move;}
h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;}
</style>
<script>
window.onload = function ()
{
var oWin = document.getElementById("win");
var oLay = document.getElementById("overlay");
var oBtn = document.getElementsByTagName("button")[0];
var oClose = document.getElementById("close");
var oH2 = oWin.getElementsByTagName("h2")[0];
var bDrag = false;
var disX = disY = 0;
oBtn.onclick = function ()
{
oLay.style.display = "block";
oWin.style.display = "block"
};
oClose.onclick = function ()
{
oLay.style.display = "none";
oWin.style.display = "none"
};
oClose.onmousedown = function (event)
{
(event || window.event).cancelBubble = true;
};
oH2.onmousedown = function (event)
{
var event = event || window.event;
bDrag = true;
disX = event.clientX - oWin.offsetLeft;
disY = event.clientY - oWin.offsetTop;
this.setCapture && this.setCapture();
return false
};
document.onmousemove = function (event)
{
if (!bDrag) return;
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxL = document.documentElement.clientWidth - oWin.offsetWidth;
var maxT = document.documentElement.clientHeight - oWin.offsetHeight;
iL = iL < 0 ? 0 : iL;
iL = iL > maxL ? maxL : iL;
iT = iT < 0 ? 0 : iT;
iT = iT > maxT ? maxT : iT;
oWin.style.marginTop = oWin.style.marginLeft = 0;
oWin.style.left = iL + "px";
oWin.style.top = iT + "px";
return false
};
document.onmouseup = window.onblur = oH2.onlosecapture = function ()
{
bDrag = false;
oH2.releaseCapture && oH2.releaseCapture();
};
};
</script>
<meta charset="utf-8">
</head>
<body>
<div id="overlay"></div>
<div id="win"><h2><span id="close">×</span></h2>
<li><a href='http://www.100sucai.com' target='_blank'>http://www.100sucai.com</a></li>
<li><a href="http://www.100sucai.com/web/jquerytexiao/CSS3heHtml5" title="CSS3和Html5">CSS3和Html5</a></li>
<li><a href="http://www.100sucai.com/web/jquerytexiao/tubiaoyutuxing" title="图表与图形">图表与图形</a></li>
</div>
<center><button>弹出层</button></center>
</body>
</html><br />
jq代码：
代码示例二：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>jQuery弹出层效果</title>
<meta content="网页特效,特效代码,jQuery,css特效,Js代码,广告幻灯,图片切换" name="keywords" />
<meta content="jQuery弹出层效果，有关闭按钮，代码简单易懂，你可以随意修改弹出层的参数。" name="description" />
<script src="/uploads/common/js/jquery-1.4.2.min.js" type="text/javascript"></script>
<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=80);
}
.white_content {
display: none;
position: absolute;
top: 10%;
left: 10%;
width: 80%;
height: 80%;
border: 16px solid lightblue;
background-color: white;
z-index:1002;
overflow: auto;
}
.white_content_small {
display: none;
position: absolute;
top: 20%;
left: 30%;
width: 40%;
height: 50%;
border: 16px solid lightblue;
background-color: white;
z-index:1002;
overflow: auto;
}
</style>
<script type="text/javascript">
//弹出隐藏层
function ShowDiv(show_div,bg_div){
document.getElementById(show_div).style.display='block';
document.getElementById(bg_div).style.display='block' ;
var bgdiv = document.getElementById(bg_div);
bgdiv.style.width = document.body.scrollWidth;
// bgdiv.style.height = $(document).height();
$("#"+bg_div).height($(document).height());
};
//关闭弹出层
function CloseDiv(show_div,bg_div)
{
document.getElementById(show_div).style.display='none';
document.getElementById(bg_div).style.display='none';
};
</script>
</head>
<body>
<input id="Button1" type="button" value="点击弹出层" onclick="ShowDiv('MyDiv','fade')" />
<!--弹出层时背景层DIV-->
<div id="fade" class="black_overlay">
</div>
<div id="MyDiv" class="white_content">
<div style="text-align: right; cursor: default; height: 40px;">
<span style="font-size: 16px;" onclick="CloseDiv('MyDiv','fade')">关闭</span>
</div>
目前来说，我还是喜欢这个自己改造的弹出层。自己在项目中也用的是这个。
</div>
</body>
</html>
以上通过jq和js分别实现了遮罩层点击按钮弹出并且具有拖动和关闭效果，希望对大家有所帮助。