遮罩层点击按钮弹出并且具有拖动和关闭效果（两种方法）

前端技术 2023/09/06 JavaScript

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。

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