随机背景图片 CSS3 [英] Random background images CSS3

问题描述

我正在做一个小型网站，但是我的背景有 5-6 张图片，我希望每次刷新页面时都让它随机.这就是我在 style.css 中得到的:

I am doing small website, however I have like 5-6 images for my background, and I want to make it random every time I refresh the page. This is what I got in style.css :

html {   
    background:  url(image/l2.jpg) no-repeat center center fixed
    -webkit-background-size: cover
    -moz-background-size: cover
    -o-background-size: cover
    background-size: cover   
}

推荐答案

你不能只用html &用于此目的的 css.您应该在客户端(如 javascript)或服务器端(如 php 脚本)进行操作

You cant use only html & css for this purpose. You should do it client side(like with javascript) or server side(like a php script)

这里是 php 示例:

Here's php example:

<?php
  $bg = array('bg-01.jpg', 'bg-02.jpg', 'bg-03.jpg', 'bg-04.jpg', 'bg-05.jpg', 'bg-06.jpg', 'bg-07.jpg' ); // array of filenames

  $i = rand(0, count($bg)-1); // generate random number size of the array
  $selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen
?>

<style type="text/css">
<!--
body{
background: url(images/<?php echo $selectedBg; ?>) no-repeat;
}
-->
</style>

这里是 jquery 示例:

Here's jquery example:

var images = ['image1.jpg', 'image2.jpg', 'image3.jpg', 'image4.jpg', 'image5.jpg'];
$('html').css({'background-image': 'url(images/' + images[Math.floor(Math.random() * images.length)] + ')'});

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