CSS3过渡:*IN*和*OUT*的不同过渡(或从过渡状态返回)

Question

原始问题...更新下面的工作代码:

我有一个加载图像,在ajax加载事件期间出现.通过向body元素添加或删除"loading"类来显示/隐藏图像.目前,加载图像将背景大小设置为0到100%,并且不透明度渐变(反之亦然,"返回"转换).

但是,我想要实现的是在淡出时立即进行背景大小转换(而不是转换),因此:

• 淡入:不透明度从0到1 in .2s,背景大小从0到100%in .2s

• 淡出:在.2s内从1到0的不透明度,从100%到0的背景大小应立即发生

  #loader {
      width: 100%;
      height: 100%;
      position: fixed;
      top: 0;
      left: 0;
      z-index: -1;
      opacity: 0;
      -moz-opacity: 0;
      transition: all .2s ease-in-out
  }
  
  
  #loader .image {
      width: 400px;
      height: 138px;
      display: block;
      position: absolute;
      z-index: 2000; 
      top: 50%; 
      left: 50%; 
      margin: 0;
      background: url(assets/images/loading.png) no-repeat;
      background-size: 0 0;
      transition: all .2s ease-in-out;
      -webkit-animation: pulse 400ms ease-out infinite alternate;
      -moz-animation: pulse 400ms ease-out infinite alternate;
      -o-animation: pulse 400ms ease-out infinite alternate;
      animation: pulse 400ms ease-out infinite alternate
  }
  
  .loading #loader {z-index: 1000; background-color: rgba(255,255,255,.7)}
  
  .loading #loader .image {
      background-size: 100% 100%; 
      margin: -69px 0 0 -200px;
      transition: opacity .2s ease-in-out
  }
  

我已将此选择器的过渡属性更改.loading #loader .image为"不透明度"而不是"全部",但它仍然执行背景大小过渡.

有谁知道如何使用css3实现上述不同的淡入和淡出过渡？谢谢!

---

更新的工作准则

问题是将各个属性(边距,背景)分成逗号分隔列表.我相信使用转换:所有将阻止您能够执行不同的IN和OUT转换.

#loader {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    opacity: 0;
    -moz-opacity: 0;
    .transition(opacity,.4s);
}

#loader .image {
    width: 400px;
    height: 138px;
    display: block;
    position: absolute;
    z-index: 2000; 
    top: 50%; 
    left: 50%; 
    margin: 0;
    background: url(assets/images/loading.png) no-repeat;
    background-size: 0 0;

    -webkit-transition: margin .4s ease-in-out;
    -moz-transition: margin .4s ease-in-out;
    -o-transition: margin .4s ease-in-out;
    -ms-transition: margin .4s ease-in-out;
    transition: margin .4s ease-in-out;

    -webkit-animation: pulse 400ms ease-out infinite alternate;
    -moz-animation: pulse 400ms ease-out infinite alternate;
    -o-animation: pulse 400ms ease-out infinite alternate;
    animation: pulse 400ms ease-out infinite alternate
}

.loading #loader {z-index: 1000; background-color: rgba(255,255,255,.7)}

.loading #loader .image {
    background-size: 100% 100%; 
    margin: -69px 0 0 -200px;

    -webkit-transition: background .4s ease-in-out, margin .4s ease-in-out;
    -moz-transition: background .4s ease-in-out, margin .4s ease-in-out;
    -o-transition: background .4s ease-in-out, margin .4s ease-in-out;
    -ms-transition: background .4s ease-in-out, margin .4s ease-in-out;
    transition: background .4s ease-in-out, margin .4s ease-in-out;
}

Answer 1

这是一个简化的测试用例:

div {
    background: blue;
    opacity: 0;
    transition: opacity 2s ease-in-out;
}

div.loading {
    opacity: 1;
    background: red;
    transition: opacity 2s ease-in-out, background 1s ease-in;
}

注意opacity淡入淡出和淡入淡出,但background唯一淡入淡出,并在淡出时立即变为蓝色.

我用它:hover作为一个例子,但在使用JavaScript添加和删除类时它应该是一样的.

演示

如果您想要一个更具体的例子,请在dabblet或Jsfiddle上提供简化的测试用例.