如何每 X 秒更改一次背景图像? [英] How do I change the background image every X seconds?

问题描述

我有一个 div 填充整个页面(投资组合样式).div 有这种风格:

.image-head {背景:url('http://placehold.it/1920x1080') 无重复顶部中心固定；背景尺寸:封面；高度:100%；宽度:100%；边距:0；填充:0；颜色:黑色;文本对齐:居中；}

基本上，我想要做的是每 X 秒更改 div 指向它的背景图像的 url，但我不确定如何执行此操作.

我的标记目前如下所示:

<div class="centering-hack"><h1>HTML</h1>

这里最简单/最好的解决方案是什么?

谢谢！

如果 JS 库使任何事情变得更容易，我将使用 Bootstrap 3

解决方案

用你想要使用的图像制作一个数组:

var 图像 = ["https://www.royalcanin.com/~/media/Royal-Canin/Product-Categories/cat-adult-landing-hero.ashx","https://www.petfinder.com/wp-content/uploads/2013/09/cat-black-superstifiable-fcs-cat-myths-162286659.jpg",https://upload.wikimedia.org/wikipedia/commons/4/4d/Cat_March_2010-1.jpg"]

我们检索要更改其背景的 div:

var imageHead = document.getElementById("image-head");

您现在可以使用 setInterval 每秒(或您想要的任何间隔)更改背景图片网址:

var i = 0;设置间隔(函数(){imageHead.style.backgroundImage = "url(" + images[i] + ")";i = i + 1;如果(我 == 图像.长度){我 = 0;}}, 1000);

这是一个活生生的例子:https://jsfiddle.net/vvwcfkfr/1/>

使用函数式编程、ES6 和递归的一些改进:

const 猫 = ["https://www.royalcanin.com/~/media/Royal-Canin/Product-Categories/cat-adult-landing-hero.ashx","https://www.petfinder.com/wp-content/uploads/2013/09/cat-black-superstifiable-fcs-cat-myths-162286659.jpg",https://upload.wikimedia.org/wikipedia/commons/4/4d/Cat_March_2010-1.jpg"]const node = document.getElementById("image-head");const cycleImages = (images, container, step) =>{images.forEach((image, index) => (setTimeout(() => {container.style.backgroundImage = `url(${image})`}, 步骤 * (index + 1))))setTimeout(() => cycleImages(images, container, step), step * images.length)}循环图像(猫，节点，1000)

https://jsfiddle.net/du2parwq/

I have a div that fills the entirety of a page (portfolio style). The div has this style:

.image-head {
  background: url('http://placehold.it/1920x1080') no-repeat top center fixed;
  background-size: cover;
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  color: black;
  text-align: center;
}

Basically, what I want to do is every X seconds change the url that the div points to for it's background image, but I am unsure on how to do this.

My markup currently looks like this:

<div class="image-head">
  <div class="centering-hack">
    <h1>Something HTML</h1>
  </div>
</div>

What's the simplest/best solution here?

Thanks!

Edit: I'm using Bootstrap 3 if the JS library makes anything easier

解决方案

Make an array with the images you want to use:

var images = [
  "https://www.royalcanin.com/~/media/Royal-Canin/Product-Categories/cat-adult-landing-hero.ashx",
  "https://www.petfinder.com/wp-content/uploads/2013/09/cat-black-superstitious-fcs-cat-myths-162286659.jpg",
  "https://upload.wikimedia.org/wikipedia/commons/4/4d/Cat_March_2010-1.jpg"
]

We retrieve the div whose background you want to change:

var imageHead = document.getElementById("image-head");

You can now use setInterval to change the background image url every second (or whatever interval you want):

var i = 0;
setInterval(function() {
      imageHead.style.backgroundImage = "url(" + images[i] + ")";
      i = i + 1;
      if (i == images.length) {
        i =  0;
      }
}, 1000);

Here's a live example: https://jsfiddle.net/vvwcfkfr/1/

Some improvements using functional programming, ES6 and recursiveness:

const cats = [
  "https://www.royalcanin.com/~/media/Royal-Canin/Product-Categories/cat-adult-landing-hero.ashx",
  "https://www.petfinder.com/wp-content/uploads/2013/09/cat-black-superstitious-fcs-cat-myths-162286659.jpg",
  "https://upload.wikimedia.org/wikipedia/commons/4/4d/Cat_March_2010-1.jpg"
]

const node = document.getElementById("image-head");

const cycleImages = (images, container, step) => {
    images.forEach((image, index) => (
    setTimeout(() => {
        container.style.backgroundImage = `url(${image})`  
    }, step * (index + 1))
  ))
  setTimeout(() => cycleImages(images, container, step), step * images.length)
}

cycleImages(cats, node, 1000)

https://jsfiddle.net/du2parwq/

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