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js实现页面遮罩层，并且阻止页面body滚动

2017-12-28 11:08 751 查看

<!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>
<title>DIV CSS遮罩层</title>
<script language="javascript" type="text/javascript">
function showdiv() {
document.getElementById("bg").style.display ="block";
document.getElementById("show").style.display ="block";
}
function hidediv() {
document.getElementById("bg").style.display ='none';
document.getElementById("show").style.display ='none';
}
</script>
<style type="text/css">
#bg {
display: none;
position: absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: black;
z-index: 1001;
-moz-opacity: 0.7;
opacity: .70;
filter: alpha(opacity=70);
}
#show {
display: none;
position: absolute;
top: 25%;
left: 22%;
width: 53%;
height: 49%;
padding: 8px;
border: 8px solid #E8E9F7;
background-color: white;
z-index: 1002;
overflow: auto;
}
body
{
padding-top: 100px;
}
</style>
</head>
<body>
<input id="btnshow" type="button" value="Show" onclick="showdiv();"/>
<div id="bg"></div>
<div id="show">测试
<input id="btnclose" type="button" value="Close" onclick="hidediv();"/>
</div>
</body>
</html>

发现当有滚动条时就出现问题了。

经过改动的代码如下

<!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>
<title>DIV CSS遮罩层</title>
<script src="js/jquery-1.11.3.min.js"></script>
<script language="javascript" type="text/javascript">
function showdiv() {
document.getElementById("bg").style.display ="block";
document.getElementById("show").style.display ="block";

$('body').css("overflow", "hidden")
}
function hidediv() {
document.getElementById("bg").style.display = 'none';
document.getElementById("show").style.display = 'none';
$('body').css("overflow", "auto")
}
</script>
<style type="text/css">
#bg {
display: none;
position: fixed;
top: 0;
left: 0;
bottom: 0;
right: 0;
background-color: black;
z-index: 1001;
-moz-opacity: 0.7;
opacity: .70;
filter: alpha(opacity=70);
}
#show {
display: none;
position: absolute;
top: 25%;
left: 22%;
width: 53%;
height: 49%;
padding: 8px;
border: 8px solid #E8E9F7;
background-color: white;
z-index: 1002;
overflow: auto;
}
body {
padding-top: 300px;
}
</style>
</head>
<body>
<input id="btnshow" type="button" value="Show" onclick="showdiv();"/>
<div id="bg"></div>
<div id="show">测试
<input id="btnclose" type="button" value="Close" onclick="hidediv();"/>

</div>

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</body>
</html>

完美解决。

从上面的问题中我们总结出以上两条经验。

1、fixed的的作用是

overflow:hidden。才有效，如果页面有滚动条，fixed的意义是不存在的。这是fixed的bug

2、让一个层在body中全部占满有下面的方式

1、left:0;top:0;width:100%;height:100%；position:fixed
2、left:0;top:0;right：0；bottom：0；posioton:fixed;

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标签： css js jquery

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