背景色的过渡

Question

我正在尝试使用background-color悬停菜单项时的过渡效果,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;
}

这#nav div是一个菜单ul项目列表.

Answer 1

据我所知,转换目前适用于Safari,Chrome,Firefox,Opera和Internet Explorer 10+.

这应该会在这些浏览器中产生淡入淡出效果:

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>

注意:正如Gerald在评论中指出的那样,如果你将过渡放在上面a,a:hover当你的鼠标离开链接时,它将会淡化回原来的颜色.

这也可能派上用场:CSS基础:CSS 3过渡

Answer 2

对我来说,最好将转换代码与原始/最小选择器放在一起,而不是使用:hover或任何其他附加选择器:

#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>

Answer 3

实现此目的的另一种方法是使用animation提供更多控制的方法。

/* 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;
}