HTML学习笔记：让div在屏幕居中，图片在div里居中
【摘要】
目录
一、效果演示
二、实现方法
方法一：利用CSS实现
方法二：利用JavaScript实现
方法三：利用JavaScript实现
方法四：利用jQuery实现
一、效果演示
二、实现方法
方法一：利用CSS实现
<!DOCTYPE html><html lang="e...
目录
一、效果演示
二、实现方法
方法一：利用CSS实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo01</title>
<style type="text/css">
#div {
width: 400px;
height: 350px;
background-color: #c8e5bc;
position: absolute;
top:50%;
left: 50%;
margin: -200px 0 0 -175px;
}
#img {
width: 220px;
height: 220px;
position: absolute;
top:50%;
left: 50%;
margin: -110px 0 0 -110px;
}
</style>
</head>
<body>
<div id="div">
<img id="img" src="images/product4.jpg">
</div>
</body>
</html>
方法二：利用JavaScript实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo02</title>
<style type="text/css">
#div {
width: 400px;
height: 350px;
background-color: #c8e5bc;
}
#img {
width: 220px;
height: 220px;
}
</style>
<script type="text/javascript">
function centerDiv() {
var div = document.getElementById('div');
var width = div.offsetWidth;
var height = div.offsetHeight;
div.style.position = "absolute";
div.style.left = "50%";
div.style.top = "50%";
div.style.marginLeft = "-" + (width / 2) + "px";
div.style.marginTop = "-" + (height / 2) + "px";
}
function centerImg() {
var img = document.getElementById('img');
var width = img.offsetWidth;
var height = img.offsetHeight;
img.style.position = "absolute";
img.style.left = "50%";
img.style.top = "50%";
img.style.marginLeft = "-" + (width / 2) + "px";
img.style.marginTop = "-" + (height / 2) + "px";
}
window.onload = function(){
centerDiv();
centerImg();
}
window.onresize = function () {
centerDiv();
centerImg();
}
</script>
</head>
<body>
<div id="div">
<img id="img" src="images/product4.jpg">
</div>
</body>
</html>
方法三：利用JavaScript实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo03</title>
<style type="text/css">
#div {
width: 400px;
height: 350px;
background-color: #c8e5bc;
}
#img {
width: 220px;
height: 220px;
}
</style>
<script type="text/javascript">
function centerDiv() {
var totalWidth = document.body.scrollWidth;
var totalHeight = document.body.scrollHeight;
var div = document.getElementById('div');
var width = div.offsetWidth;
var height = div.offsetHeight;
div.style.position = "absolute";
div.style.left = (totalWidth - width) / 2 + "px";
div.style.top = (totalHeight - height) / 2 + "px";
}
function centerImg() {
var div = document.getElementById('div');
var totalWidth = div.offsetWidth;
var totalHeight = div.offsetHeight;
var img = document.getElementById('img');
var width = img.offsetWidth;
var height = img.offsetHeight;
img.style.position = "absolute";
img.style.left = (totalWidth - width) / 2 + "px";
img.style.top = (totalHeight - height) / 2 + "px";
}
window.onload = function(){
centerDiv();
centerImg();
}
window.onresize = function () {
centerDiv();
centerImg();
}
</script>
</head>
<body>
<div id="div">
<img id="img" src="images/product4.jpg">
</div>
</body>
</html>
方法四：利用jQuery实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo04</title>
<script src="scripts/jquery-3.1.1.min.js"></script>
<style type="text/css">
#div {
width: 400px;
height: 350px;
background-color: #c8e5bc;
}
#img {
width: 220px;
height: 220px;
}
</style>
<script type="text/javascript">
$(window).resize(function () {
$('#div').css({
position: "absolute",
left: ($(window).width() - $('#div').width()) / 2,
top: ($(window).height() - $('#div').height()) / 2
}
);
$('#img').css({
position: "absolute",
left: ($('#div').width() - $('#img').width()) / 2,
top: ($('#div').height() - $('#img').height()) / 2
}
);
});
$(function () {
$(window).resize();
})
</script>
</head>
<body>
<div id="div">
<img id="img" src="images/product4.jpg">
</div>
</body>
</html>
说明：获取元素的宽度和高度，如果是行内样式，那么 元素.style.width和 元素.style.height可以拿到元素的宽度和高度，但是对于内部样式或外部样式，此方法就不凑效，必须使用 元素.offsetWidth和 元素.offsetHeight才能拿到元素的宽度和高度。其实用 元素.offsetWidth和 元素.offsetHeight无论在哪种情况下都能拿到元素的宽度和高度，建议使用这种方式。
文章来源: howard2005.blog.csdn.net，作者：howard2005，版权归原作者所有，如需转载，请联系作者。
原文链接：howard2005.blog.csdn.net/article/details/79357676
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