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垂直居中，水平居中html例子

2016-01-28 10:26 471 查看

<!DOCTYPE html>
<html lang="en">
<head>
<title>Vertical Centering with Equal Top and Bottom Padding</title>

<meta charset="utf-8">
<meta name="description" content="" />

<style type="text/css">
#parent {
background: #ccc;
}

/* horizontal centering */
#parent {
width: 400px;
margin: 20px auto;
}

.child {
text-align: center;
background: #999;
color: #fff;
}

/* vertical centering */
#parent {
padding: 5% 0;
}

.child {
padding: 1% 0;
}

body {
margin: 0px auto;
background-color: beige;
}
</style>

</head>

<body>
<form>
<div id="parent">
<div class="child">用户 <input type="text" /></div>
<div class="child">密码 <input type="text" /></div>
<div class="child"></div>
<div class="child" style="background: #ccc;">
<input type="submit" value="登录" style="width:80px;" /></div>
</div>
</form>
<script type="text/javascript">
var p = document.getElementById("parent");

resize_fn = function (e) {

var zbody_height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight);
var zdiv_height = Math.max(p.scrollHeight, p.clientHeight);
var ztop = (zbody_height - zdiv_height) / 2;

p.style.marginTop = ztop + "px";
};

//var w = document.getElementsByClassName("child");
var w = document.querySelectorAll(".child");

for (var i = 0; i < w.length;i++) {

var oi = w.item(i);

oi.style.background = "#ccc";

}

//p.style.background = "beige";
resize_fn();
document.body.onresize = resize_fn;
</script>
</body>
</html>

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