<title></title>
<style>
*
{
margin: 0px;
padding: 0px;
}
.mask {
width: 100%
;
height: 500px;
background-
color: black;
opacity: 0.5;
position: fixed;
top: 0px;
left: 0px;
z-index:
400;
}
.out {
width: 300px;
height: 200px;
background-
color: green;
position: fixed;
/*top: 100px;
left: 100px;*/
z-index:
998;
}
</style>
</head>
<body>
<input type=
"button" value=
"弹出" id=
"btn1" />
<div
class=
"mask" hidden=
"hidden"></div>
<div
class=
"out" hidden=
"hidden"></div>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
<p>
123</p>
</body>
</html>
<script>
var mask = document.getElementsByClassName(
"mask")[
0];
var out = document.getElementsByClassName(
"out")[
0];
var btn1 = document.getElementById(
"btn1");
var c_height =
document.documentElement.clientHeight;
var c_width =
document.documentElement.clientWidth;
var top_ = c_height /
2 -
100;
var left = c_width /
2 -
150;
mask.style.height = c_height +
"px";
out.style.top = top_ +
"px";
out.style.left = left +
"px";
btn1.onclick =
function() {
mask.removeAttribute("hidden");
out.removeAttribute(
"hidden");
}
mask.onclick =
function() {
mask.setAttribute("hidden",
"hidden");
out.setAttribute(
"hidden",
"hidden");
}
window.onresize =
function() {
var c_height =
document.documentElement.clientHeight;
var c_width =
document.documentElement.clientWidth;
var top_ = c_height /
2 -
100;
var left = c_width /
2 -
150;
mask.style.height = c_height +
"px";
out.style.top = top_ +
"px";
out.style.left = left +
"px";
}
</script>
自己再打几次 巩固一下
转载于:https://www.cnblogs.com/sistrong-5880558/p/7613087.html
相关资源：无忧隐藏9.29完全破解版
