css3背景大小覆盖到动画缩放百分比 [英] css3 background-size cover to percentage animation zoom

问题描述

我正在尝试使用背景尺寸制作缩放效果。我的问题是我需要从background-size：cover设置动画，例如background-size：105％。

Im trying to make a zoom effect with background-size. The issue I have is I need to animate from background-size:cover to something like background-size: 105%.

当我尝试使用过渡：0.1s背景尺寸线性进行动画处理时，它的动画从0到104％。

When I try this it with a "transition: 0.1s background-size linear" it animates from 0 to 104%.

无论如何，我可以将覆盖率动画化为该百分比，而不会返回到0。

Is there anyway I can animate from cover to that percentage with out going back to 0.

（即使用覆盖率，因为我不知道大小图片，但我有固定的div尺寸来显示它。）

(im using cover because I don't know the size of the image but I have a fixed size div to display it in.)

感谢
Pete

Thanks Pete

推荐答案

一种可能性是将背景设置在伪元素中，然后对基础元素进行缩放。 （例如，通过转换属性）

One posibility is to have the background set in a pseudo element, and then do the zoom in the base element. (thru transform property, for instance)

.test { 
    width: 300px;
    height: 300px;
    position: relative;
    left: 30px;
    top: 30px;
    transition: all 1s;
}

.test:hover {
    -webkit-transform: scale(1.05, 1.05);
    transform: scale(1.05, 1.05);
}

.test:after {
    content: '';
    position: absolute;
    left: 0px;
    top: 0px;
    right: 0px;
    bottom: 0px;
    background: url("http://lorempixel.com/600/400");
    background-size: cover;
}

<div class="test">
  </div>

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