背景颜色的过渡

我试图在悬停菜单项时使用background-color制作过渡效果，但它不起作用。这是我的CSS代码:

#content #nav a:hover {
color: black;
background-color: #AD310B;
/* Firefox */
-moz-transition: all 1s ease-in;
/* WebKit */
-webkit-transition: all 1s ease-in;
/* Opera */
-o-transition: all 1s ease-in;
/* Standard */
transition: all 1s ease-in;
}

#nav div是菜单ul项列表。

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小开

据我所知，目前Safari、Chrome、Firefox、Opera和Internet Explorer 10+都支持过渡功能。

这应该会在以下浏览器中产生渐隐效果:

a {
background-color: #FF0;
}


a:hover {
background-color: #AD310B;
-webkit-transition: background-color 1000ms linear;
-ms-transition: background-color 1000ms linear;
transition: background-color 1000ms linear;
}
<a>Navigation Link</a>

Note: As pointed out by Gerald in the comments, if you put the transition on the a, instead of on a:hover it will fade back to the original color when your mouse moves away from the link.

This might come in handy, too: CSS Fundamentals: CSS 3 Transitions

小开

对我来说，最好将过渡代码与原始/最小选择器放在一起，而不是与:hover或任何其他额外的选择器放在一起:

#content #nav a {
background-color: #FF0;
    

-webkit-transition: background-color 1000ms linear;
-moz-transition: background-color 1000ms linear;
-o-transition: background-color 1000ms linear;
-ms-transition: background-color 1000ms linear;
transition: background-color 1000ms linear;
}


#content #nav a:hover {
background-color: #AD310B;
}
<div id="content">
<div id="nav">
<a href="#link1">Link 1</a>
</div>
</div>

小开

另一种实现方法是使用animation，它提供了更多的控制。

/* declaring the states of the animation to transition through */
/* optionally add other properties that will change here, or new states (50% etc) */
@keyframes onHoverAnimation {
0% {
background-color: #FF0;
}
100% {
background-color: #AD310B;
}
}


#content #nav a {
background-color: #FF0;
    

/* only animation-duration here is required, rest are optional (also animation-name but it will be set on hover)*/
animation-duration: 1s; /* same as transition duration */
animation-timing-function: linear; /* kind of same as transition timing */
animation-delay: 0ms; /* same as transition delay */
animation-iteration-count: 1; /* set to 2 to make it run twice, or Infinite to run forever!*/
animation-direction: normal; /* can be set to "alternate" to run animation, then run it backwards.*/
animation-fill-mode: none; /* can be used to retain keyframe styling after animation, with "forwards" */
animation-play-state: running; /* can be set dynamically to pause mid animation*/
    

    

}


#content #nav a:hover {
/* animation wont run unless the element is given the name of the animation. This is set on hover */
animation-name: onHoverAnimation;
}

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