DIV遮罩层如何实现

时间：2021-05-08

今天有任务让加个蒙版，JS小白的我在网上找了个修改下，改成了JS模版以后可以重复用啦。

复制代码代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>遮罩</title>
<style>

#tinybox_1 {
position:absolute;
width:1002px;
height:80px;
background:#FFF;
display: none;
z-index: 99999;
border:5px solid red;
display:none;
text-align:center;
padding:10px
}
#tinybox_1 h4{ display:block; margin:0 auto; width:1002px; line-height:40px}
.main{ width:98%; height:2000px; margin:0 auto; border:2px solid red; }
</style>
<!--遮罩 begin -->
<script type="text/javascript">
function BtHide(id){var Div = document.getElementById(id);if(Div){Div.style.display="none"}}
function BtShow(id){var Div = document.getElementById(id);if(Div){Div.style.display="block"}}
function BtPopload(showId){
// 高度减去 4px，避免在页面无滚动条时显示遮罩后出现流动条
var h = (Math.max(document.documentElement.scrollHeight,document.documentElement.clientHeight) - 4) + 'px';
var w = document.documentElement.scrollWidth + 'px';
var popCss = "background:#000;opacity:0.3;filter:alpha(opacity=30);position:absolute;left:0;top:0;overflow:hidden;border:0"//遮罩背景
var rePosition_mask = function() {
pop_Box.style.height = h;
pop_Box.style.width = w;
pop_Iframe.style.height = h;
pop_Iframe.style.width = w;
if (document.documentElement.offsetWidth < 950) {
//防止正常宽度下点击时 在 ff 下出现页面滚动到顶部
document.documentElement.style.overflowX = "hidden";
}
}
var exsit = document.getElementById("popBox");
if (!exsit) {
var pop_Box = document.createElement("div");
pop_Box.id = "popBox";
document.getElementsByTagName("body")[0].appendChild(pop_Box);
pop_Box.style.cssText = popCss;
pop_Box.style.zIndex = "10";
var pop_Iframe = document.createElement("iframe"); // 这里如果用 div 的话，在 ie6 不能把 <select> 遮住
pop_Iframe.id = "popIframe";
document.getElementsByTagName("body")[0].appendChild(pop_Iframe);
pop_Iframe.style.cssText = popCss;
pop_Iframe.style.zIndex = "9";
rePosition_mask();
}
BtShow("popIframe");
BtShow("popBox");
BtShow(showId);
var pop_Win = document.getElementById(showId);
pop_Win.style.position = "absolute";
pop_Win.style.zIndex = "11";
var rePosition_pop = function() {
pop_Win.style.top = document.documentElement.scrollTop + document.body.scrollTop + document.documentElement.clientHeight/2 - pop_Win.offsetHeight/2 + 'px';
pop_Win.style.left = document.documentElement.scrollLeft + document.body.scrollLeft + document.documentElement.clientWidth/2 - pop_Win.offsetWidth/2 + 'px';
}
rePosition_pop();
window.onresize = function(){
w = document.documentElement.offsetWidth + 'px'; // 使用 scrollWidth 不能改变宽度
rePosition_mask();
rePosition_pop();
}
window.onscroll = function(){
rePosition_pop();
}
}
function BtPopShow(Bid,Did) {
var UploadBtn = document.getElementById(Bid);
if (UploadBtn){UploadBtn.onclick = function() {BtPopload(Did);return false;}}
}
function BtPopHide(Bid,Did) {
var UploadBtn = document.getElementById(Bid);
if (UploadBtn){UploadBtn.onclick = function() {BtHide(Did);BtHide("popBox");BtHide("popIframe");return false;}}
}
</script>
<!--遮罩 end -->
</head>
<body>
<div class="main">
<select>
<option>ie6下不显示</option>
</select>
</div>
<div><input type="button" id="open_1" value="确认"></div>
<!-- 遮罩层 begin -->
<div id="tinybox_1">
<h4>感谢您的光临，定制需求单送出后，我们将安排专人在24小时内为您服务！</h4>
<a href="#" id="close_1">关闭</a>
</div>
<script type="text/javascript">
BtPopShow("open_1","tinybox_1");
BtPopHide("close_1","tinybox_1")
</script>
<!-- 遮罩层 end -->
</body>
</html>

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