html - 淡化背景但不淡化文本

Question

我已将 CSS 淡入/淡出解决方案应用到 div，我对大部分情况都很满意。 但是我只想将它应用于背景，而不是文本。我需要文本始终完全不透明。

看例子: http://jsfiddle.net/howiepaul/gUAPV/33/

a.tab {background-color:#d4d4d4;
font-family: arial;
font-weight: bold;}

a.tab:hover {
opacity:1;
animation: tickhov 1.5s;
-moz-animation: tickhov 1.5s; /* Firefox */
-webkit-animation: tickhov 1.5s; /* Safari and Chrome */}
@-ms-keyframes tickhov {from {opacity:0.2;} to {opacity:1;}}
@-moz-keyframes tickhov /* Firefox */ {from {opacity:0.2;} to {opacity:1;}}
@-webkit-keyframes tickhov /* Safari and Chrome */ {from {opacity:0.2;} to {opacity:1;}}

a.tab{
opacity:0.2;
animation: letgo 1.5s;
-moz-animation: letgo 1.5s; /* Firefox */
-webkit-animation: letgo 1.5s; /* Safari and Chrome */}
@-ms-keyframes letgo {from {opacity:1;} to {opacity:0.2; visibility: hidden; display: none;}}
@-moz-keyframes letgo /* Firefox */ {from {opacity:1;} to {opacity:0.2; visibility: hidden; display: none;}}
@-webkit-keyframes letgo /* Safari and Chrome */ {from {opacity:1;} to {opacity:0.2; visibility: hidden; display: none;}}

如有任何帮助，我们将不胜感激。

非常感谢 豪伊

Answer 1

您应该在 background-color 而不是 opacity 上设置动画。仅供引用，如果这就是您所做的全部，您应该使用过渡而不是动画，它们要简单得多。

jsFiddle

a.tab {
    position:relative;
    font-family: arial;
    font-weight: bold;
    background-color:rgba(212,212,212,.2);
    -moz-transition:background-color 1.5s ease;
    -webkit-transition:background-color 1.5s ease;
    transition:background-color 1.5s ease;
}

a.tab:hover {
    background-color:rgba(212,212,212,1);
}