jquery - 在响应式背景图像上更改一次背景图像

Question

我用的就是这个

background: url(bilder/cover.jpg) no-repeat center center fixed; 
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}

我想要完成的是，背景图像在大约 2 秒后更改为背景图像，然后保持不变。

我知道有 Jqueries 可以像这样更改背景，但我不确定如何使用我正在使用的代码来实现类似的功能!如果有人对此有解决方案，那就太棒了!

我改变背景的起点是我在 w3schools 上找到的代码:

{
width:100px;
height:100px;
background:red;
animation:myfirst 5s;
-webkit-animation:myfirst 5s; /* Safari and Chrome */
}

@keyframes myfirst
{
from {background:red;}
to {background:yellow;}
}

@-webkit-keyframes myfirst /* Safari and Chrome */
{
from {background:red;}
to {background:yellow;}
}

Answer 1

EXAMPLE

HTML

<div id="myBackground"></div>

CSS

#myBackground {
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;

    background: url(http://jsfiddle.net/img/initializing.png) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

JavaScript

var imgUrl = "url(http://cdn.css-tricks.com/wp-content/themes/CSS-Tricks-10/images/bg.png)";

$(function() {    //    starts when page is loaded and ready
    setTimeout(function() {
        $("#myBackground").css("background-image", imgUrl);
    }, 2000);    //    2 second timer
})

---

Alternate Style (with FadeIn/Out effect)

HTML

<div id="myBackground">
    <img src="http://jsfiddle.net/img/initializing.png" />
    <img src="http://cdn.css-tricks.com/wp-content/themes/CSS-Tricks-10/images/bg.png" />
</div>

CSS

#myBackground {
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
}
#myBackground img {
    height: 100%;
    width: 100%;
}
#myBackground img:nth-child(2) {
    display: none;
}

JavaScript

$(function() {    //    starts when page is loaded and ready
    setTimeout(function() {
        $("#myBackground img:nth-child(1)").fadeOut("slow");
        $("#myBackground img:nth-child(2)").fadeIn(1500);
    }, 2000);    //    2 second timer
})