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CSS3動畫:5種預載動畫效果實例
編輯:關於CSS     

實現如圖所示的動畫效果:

預載動畫一:雙旋圈

在兩個不同方向旋轉的圓圈。我們對內圈的轉速定義了一個CSS代碼,即內圈比外圈的速率快2倍。
 

實現如圖所示:

html代碼:

<body style="background: #ffb83c;">
    <div id="preloader-1">
        <span></span>
        <span></span>
    </div>
</body>

css代碼:

#preloader-1{
    position: relative;
}
#preloader-1 span{
    position: absolute;
    border:8px solid #fff;
    border-top:8px solid transparent;
    border-radius: 999px;
}
#preloader-1 span:nth-child(1){
    width:80px;
    height: 80px;
    animation: spin-1 2s infinite linear;
}
#preloader-1 span:nth-child(2){
    top:20px;
    left:20px;
    width:40px;
    height: 40px;
    animation: spin-2 1s infinite linear;
}
@keyframes spin-1{
    0%{transform: rotate(360deg); opacity: 1.0;}
    50%{transform: rotate(180deg); opacity: 0.5;}
    100%{transform: rotate(0deg);opacity: 0;}
}
@keyframes spin-2{
    0%{transform: rotate(0deg); opacity: 0.5;}
    50%{transform: rotate(180deg); opacity: 1;}
    100%{transform: rotate(360deg);opacity: 0.5;}
}

預載動畫二:交錯圈

兩個圓圈進行橫向交錯來回移動。每個圓圈都設置了單獨的反向移動動畫參數。
 

效果:

html代碼:

<body style="background: #4ad3b4;">
    <div id="preloader-2">
        <span></span>
        <span></span>
    </div>
</body>

css代碼:

#preloader-2{
    position: relative;
}
#preloader-2 span{
    position: absolute;
    width:30px;
    height: 30px;
    background: #fff;
    border-radius: 999px;
}
#preloader-2 span:nth-child(1){
    animation: cross-1 1.5s infinite linear;
}
#preloader-2 span:nth-child(2){
    animation: cross-2 1.5s infinite linear;
}
@keyframes cross-1{
    0%{transform: translateX(0); opacity: 0.5;}
    50%{transform: translateX(80px); opacity: 1;}
    100%{transform: translateX(0);opacity: 0.5;}
}
@keyframes cross-2{
    0%{transform: translateX(80px); opacity: 0.5;}
    50%{transform: translateX(0); opacity: 1;}
    100%{transform: translateX(80px);opacity: 0.5;}
}

預載動畫三:旋轉圈

效果:

html代碼:

 

<body style="background: #ab69d9;">
    <div id="preloader-3">
        <span></span>
    </div>
</body>

css代碼:

#preloader-3{
    position: relative;
    width:80px;
    height: 80px;
    border:4px solid rgba(255,255,255,.25);
    border-radius: 999px;
    
}
#preloader-3 span{
    position: absolute;
    width:80px;
    height:80px;
    border:4px solid transparent;
    border-top:4px solid #fff;
    border-radius: 999px;
    top:-4px;
    left:-4px;
    animation: rotate 1s infinite linear;
}
@keyframes rotate{
    0%{transform: rotate(0deg);}
    100%{transform: rotate(360deg);}
}

預載動畫四:跳動圈

這是一種墨西哥波浪紋的動畫效果,通過設置不同圓圈之間的延遲參數來實現。
 

效果:

html代碼:

<body style="background: #c1d64a;">
    <div id="preloader-4">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>

css代碼:

#preloader-4{
    position: relative;
}
#preloader-4 span{
    position:absolute;
    width:16px;
    height: 16px;
    border-radius: 999px;
    background: #fff;
    animation: bounce 1s infinite linear;
}
#preloader-4 span:nth-child(1){
    left:0;
    animation-delay: 0s;
}
#preloader-4 span:nth-child(2){
    left:20px;
    animation-delay: 0.25s;
}
#preloader-4 span:nth-child(3){
    left:40px;
    animation-delay: 0.5s;
}
#preloader-4 span:nth-child(4){
    left:60px;
    animation-delay: 0.75s;
}
#preloader-4 span:nth-child(5){
    left:80px;
    animation-delay: 1.0s;
}
@keyframes bounce{
    0%{transform: translateY(0px);opacity: 0.5;}
    50%{transform: translateY(-30px);opacity: 1.0;}
    100%{transform: translateY(0px);opacity: 0.5;}
}

預載動畫五:雷達圈

一種雷達輻射效果,給3個span elements設置相同的淡入淡出效果,再予每個稍微延遲下即可實現。
 

效果:

html代碼:

<body style="background: #f9553f;">
    <div id="preloader-5">
        <span></span>
        <span></span>
        <span></span>
    </div>
</body>

css代碼:

#preloader-5{
    position: relative;
}
#preloader-5 span{
    position:absolute;
    width:50px;
    height: 50px;
    border:5px solid #fff;
    border-radius: 999px;
    opacity: 0;
    animation: radar 2s infinite linear;
}
#preloader-5 span:nth-child(1){
    animation-delay: 0s;
}
#preloader-5 span:nth-child(2){
    
    animation-delay: 0.66s;
}
#preloader-5 span:nth-child(3){
    animation-delay: 1.33s;
}

@keyframes radar{
    0%{transform: scale(0);opacity: 0;}
    25%{transform: scale(0);opacity: 0.5;}
    50%{transform: scale(1);opacity: 1.0;}
    75%{transform: scale(1.5);opacity: 0.5;}
    100%{transform: scale(2);opacity: 0;}
}

以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持。

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