這篇文章主要介紹了CSS3動畫：5種預載動畫效果實例，內容蠻不錯的，現在分享給大家，也給大家做個參考。
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。
實作如圖所示：
html程式碼：
##
<body style="background: #ffb83c;">
<p id="preloader-1">
<span></span>
<span></span>
</p>
</body>#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。每個圓圈都設定了單獨的反向移動動畫參數。
<body style="background: #4ad3b4;">
<p id="preloader-2">
<span></span>
<span></span>
</p>
</body>#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：
<body style="background: #ab69d9;">
<p id="preloader-3">
<span></span>
</p>
</body>#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，透過設定不同圓圈之間的延遲參數來實現。
<body style="background: #c1d64a;">
<p id="preloader-4">
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</p>
</body>#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，為3個span elements設定相同的淡入淡出效果，再予每個稍微延遲下即可實現。
<body style="background: #f9553f;">
<p id="preloader-5">
<span></span>
<span></span>
<span></span>
</p>
</body>#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;}
}#
以上是CSS3實現預載動畫效果的幾種方法的詳細內容。更多資訊請關注PHP中文網其他相關文章！
