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我有一个有 3 个圆圈的 CSS3 圆圈加载器。我遇到了问题 每个圆圈（从第一个圆圈开始）应该在几秒钟后淡出，可能使用 CSS 动画。任何帮助表示赞赏。

jsFiddle

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3 回答 3

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I'd go a slightly different route. Only made for webkit but you can alter as needed: http://jsfiddle.net/8kQ2u/17/

@-webkit-keyframes fades {
    0%, 100% { 
       opacity: 1;
    }
    50% {
       opacity: 0;
    }
}

.circle span  {
  display: inline-block;
  width: 15px;
  height: 15px;
  margin: 9.975em auto;
  background: #dbdbdb;
  -webkit-border-radius: 50px;
  -moz-border-radius: 50px;
  -ms-border-radius: 50px;
  -o-border-radius: 50px;
  border-radius: 50px;
  -webkit-animation-duration: 1.5s;
  -webkit-animation-name: fades;
  -webkit-animation-iteration-count: infinite;
}

.circle span:nth-child(2) {
    -webkit-animation-delay: 0.2s;
}

.circle span:nth-child(3) {
    -webkit-animation-delay: 0.4s;
}
​

:nth-child here is fine since I'm pretty sure it has full support in browsers that support @keyframes. You could use the sibling selector if you prefered (+).

于 2012-12-21T15:22:58.033 回答
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使用关键帧就可以了：http: //jsfiddle.net/Nux3z/

几个细节：

1) Use of :nth-child, or :first-child, etc to target your elements
2) Timing of animations: I'm using 1.7, 2.7, rather than 0.7s, 1.4s because I'm allowing for the 1s of fade to finish NOT simply doubling/tripling the time each element takes to animate.
3) Not a solution for IE
于 2012-12-21T15:32:56.070 回答
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正如其他人所说，在这里使用动画和时间是必不可少的。
实际上，每个圆圈都使用相同的动画，
但是您必须对每个圆圈应用不同的延迟。

见下文（我也在使用nth-child代替first-child）：

.circle span {
    /** The same animation to each circle **/
    -webkit-animation: circleFade 3s linear infinite;
}

/** Different animation delays **/
.circle span:nth-child(1) { -webkit-animation-delay: 1s; }
.circle span:nth-child(2) { -webkit-animation-delay: 2s; }
.circle span:nth-child(3) { -webkit-animation-delay: 3s; }

/** Animation **/
@-webkit-keyframes circleFade {
     0% { background: #ddd; }
    25% { background: #999; }
    35% { background: #999; }
    60% { background: #ddd; }
}​

[看小提琴]
[现在看花哨的小提琴]

于 2012-12-21T15:53:45.683 回答