• FCC---Animate Elements at Variable Rates----一闪一闪亮晶晶,不同的闪动节奏


    There are a variety of ways to alter the animation rates of similarly animated elements.

    So far, this has been achieved by applying an animation-iteration-count property and setting @keyframes rules.

    To illustrate, the animation on the right consists of two "stars" that each decrease in size and opacity at the 20% mark in the @keyframes rule, which creates the twinkle animation.

    You can change the @keyframes rule for one of the elements so the stars twinkle at different rates.

    练习题目:

    Alter the animation rate for the element with the class name of star-1 by changing its @keyframes rule to 50%.

    练习代码:

     1 <style>
     2   .stars {
     3     background-color: white;
     4     height: 30px;
     5     width: 30px;
     6     border-radius: 50%;
     7     animation-iteration-count: infinite;
     8   }
     9 
    10   .star-1 {
    11     margin-top: 15%;
    12     margin-left: 60%;
    13     animation-name: twinkle-1;
    14     animation-duration: 1s;
    15   }
    16 
    17   .star-2 {
    18     margin-top: 25%;
    19     margin-left: 25%;
    20     animation-name: twinkle-2;
    21     animation-duration: 1s;
    22   }
    23 
    24   @keyframes twinkle-1 {
    25     50% {
    26       transform: scale(0.5);
    27       opacity: 0.5;
    28     }
    29   }
    30 
    31   @keyframes twinkle-2 {
    32     20% {
    33       transform: scale(0.5);
    34       opacity: 0.5;
    35     }
    36   }
    37 
    38   #back {
    39     position: fixed;
    40     padding: 0;
    41     margin: 0;
    42     top: 0;
    43     left: 0;
    44     width: 100%;
    45     height: 100%;
    46     background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
    47   }
    48 </style>
    49 
    50 <div id="back"></div>
    51 <div class="star-1 stars"></div>
    52 <div class="star-2 stars"></div>

    效果如下:

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  • 原文地址:https://www.cnblogs.com/jane-panyiyun/p/11756893.html
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