css过渡不透明度的背景颜色

Question

寻找线索,如何在过渡时使用背景颜色的不透明度？

我正在使用rgba()功能,但转换不适用于悬停.

.bx{
  background:rgba(255,0,0,0.5);
  width:100px; height:100px;
  position:relative;
  transition: opacity .5s ease-out;
  -moz-transition: opacity .5s ease-out;
  -webkit-transition: opacity .5s ease-out;
  -o-transition: opacity .5s ease-out;
}

.bx:hover{
  background:rgba(255,0,0,1);
}

.t{
  position:absolute; 
  bottom:0px;
}

HTML

<div class="bx"><div class="t">text</div></div>

任何想法,我如何使用转换.bx？

Answer 1

事实上,opacity并且rgba()完全不同.

由于您使用属性rgba()作为背景颜色,因此background您需要使用background如下的过渡属性:

.bx {
  background: rgba(255,0,0,0.5);
  width:100px; height:100px;
  position: relative;

  -webkit-transition: background .5s ease-out;
  -moz-transition: background .5s ease-out;
  -o-transition: background .5s ease-out;
  transition: background .5s ease-out;
}

.bx:hover {
  background: rgba(255,0,0,1);
}

JSBin演示.