Bri*_*ick 5 html javascript css php web
我目前在我的网站上有一个停滞的图像:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="/stylesheets/normalize.css" media="all" rel="stylesheet" />
<link href="/stylesheets/master.css" media="all" rel="stylesheet" />
<script>
window.onload = function () {
var images = [],
i=1, indexImages = true,
prefix = '../image/',
extension = '.jpg';
while (indexImages) {
var a = new XMLHttpRequest(); a.open('GET', prefix+i+extension, false); a.send();
if (a.status != 404) { i += 1; images.push(prefix+i+extension); } else {
indexImages = false;
localStorage['backgroundIndex'] = !localStorage['backgroundIndex']?0:+localStorage['backgroundIndex']+2>images.length?0:+localStorage['backgroundIndex']+1;
document.body.style.backgroundImage = 'url(' + images[+localStorage['backgroundIndex']] + ')';
}
}
}
</script>
<style>
body {
background-repeat: no-repeat;
background-attachment: fixed;
background-position: center;
background-color: black;
border-bottom: 8px solid #7D8A28;
}
</style>
</head>
<body>
<section id="card">
</section>
</body>
</html>
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只是我希望每次页面刷新时它都是不同的图像,因此它会自动更改为 2.jpg、3.jpg、10.jpg 等等。(有数百种可供选择)
有人可以帮我解决问题吗?我不是很擅长这个,这是我的第一个网站。
谢谢。
我认为仅 CSS 无法做到这一点,这是一个答案:
window.onload = function () {
var images = [
'image/1.png',
'image/2.png',
'image/3.png',
'image/4.png'
];
document.body.style.backgroundImage = 'url(' + images[Math.floor(Math.random()*images.length)] + ')';
}
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这将在您每次访问该页面时加载随机图像。
按顺序加载它们:第一次加载 image1,第二次加载 image2。图像甚至不需要有编号即可正常工作。做:
window.onload = function () {
var images = [
'image/A.png',
'image/B.png',
'image/C.png',
'image/D.png'
];
localStorage['backgroundIndex'] = !localStorage['backgroundIndex']?0:+localStorage['backgroundIndex']+2>images.length?0:+localStorage['backgroundIndex']+1;
document.body.style.backgroundImage = 'url(' + images[+localStorage['backgroundIndex']] + ')';
}
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这将自动为您生成数组,您无需提供图像数量
window.onload = function () {
var images = [],
i = 1,
prefix = 'image/',
extension = '.png',
max = 1000;
function index() {
var a = new XMLHttpRequest();
a.open('GET', prefix + i + extension, false);
a.send();
a.onreadystatechange = function () {
if (a.readyState === 4) {
if (a.status != 404) {
i += 1;
images.push(prefix + i + extension);
i < max ? index();
} else {}
localStorage['backgroundIndex'] = !localStorage['backgroundIndex'] ? 0 : +localStorage['backgroundIndex'] + 2 > images.length ? 0 : +localStorage['backgroundIndex'] + 1;
document.body.style.backgroundImage = 'url(' + images[+localStorage['backgroundIndex']] + ')';
}
};
}
index();
}
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如果您有 PHP,这可能是在许多情况下工作的最佳解决方案。但如果可以避免的话,您确实不想使用 PHP。它将获取目录中的所有图像来生成数组:
window.onload = function () {
var images = (JSON.parse("<?=scandir('../images')?>")||[]).filter(function (a) { return ['.', '..'].indexOf(a) < 0; });
document.body.style.backgroundImage = 'url(' + images[+localStorage['backgroundIndex']] + ')';
};
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