Question

我正在尝试用纯CSS移动div元素的背景图像。在这里我从用户输入背景图像网址，这就是为什么我不能在CSS中声明它。我也不能将它声明为具有固定位置或绝对位置的图像，因为它会影响我的其余CSS。有没有办法只为div元素的背景编写CSS？

HTML：

<div class="view" style="background-image: url('http://css3slideshow.remabledesigns.com/1.jpg')">According to a new report from AnandTech, Samsung might be fibbing its way to more favorable Galaxy S4 benchmarks. Has your device suddenly come to a crawl? Of course it hasn’t; benchmarks shouldn’t change your perception of a flagship as powerful as the S4. Still, it’s embarrassing that Samsung would resort to such technical tactics, like allegedly using code dubbed “BenchmarkBooster.” Yes, your device takes steroids.</div>

CSS：

.view {
    position:relative;
    height:100%;
    width:100%;
    top:0;
    left:0;
    animation:mymove 5s infinite;
    -webkit-animation:mymove 5s infinite;
    /* Safari and Chrome */
}
@keyframes mymove {
     from {
         left:0px;
     }
     to {
         left:200px;
     }
}
@-webkit-keyframes mymove
/* Safari and Chrome */
    {
     from {
          leftp:0px;
     }
     to {
         left:200px;
     }
}

Answer 1

你需要做的是添加background-position：x，y，其中x和y等于你想要定位元素的位置的长度和高度。 http://www.w3schools.com/cssref/pr_background-position.asp

<div class="view" style="background-image: url('http://css3slideshow.remabledesigns.com/1.jpg') background-position:50px 20px;">
 According to a new report from AnandTech, Samsung might be fibbing its way to more favorable Galaxy S4 benchmarks. Has your device suddenly come to a crawl? Of course it hasn’t; benchmarks shouldn’t change your perception of a flagship as powerful as the S4. Still, it’s embarrassing that Samsung would resort to such technical tactics, like allegedly using code dubbed “BenchmarkBooster.” Yes, your device takes steroids.</div>

Answer 2

以下技巧似乎有效：将背景图像的宽度设置为元素的两倍，并将背景位置的水平部分从0更改为-200%（edited FIDDLE）：

.view {
    height:100%;
    width:100%;
    animation:mymove 5s linear infinite;
    background-size: 200% 100%; /* horizontal scale is 200% */
}
@keyframes mymove {
    from {
        background-position: 0% 0px;
    }
    to {
        background-position: -200% 0px; /* shifting the image to right by its full width */
    }
}

background-position为负百分比时移动图像的算法很好地解释了in this answer。

用纯CSS移动div元素的背景图像

2 个答案: