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小編給大家分享一下CSS3如何實(shí)現(xiàn)預(yù)載動(dòng)畫效果,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
實(shí)現(xiàn)如圖所示的動(dòng)畫效果:
預(yù)載動(dòng)畫一:雙旋圈
在兩個(gè)不同方向旋轉(zhuǎn)的圓圈。我們對(duì)內(nèi)圈的轉(zhuǎn)速定義了一個(gè)CSS代碼,即內(nèi)圈比外圈的速率快2倍。
實(shí)現(xiàn)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(yù)載動(dòng)畫二:交錯(cuò)圈
兩個(gè)圓圈進(jìn)行橫向交錯(cuò)來回移動(dòng)。每個(gè)圓圈都設(shè)置了單獨(dú)的反向移動(dòng)動(dòng)畫參數(shù)。
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(yù)載動(dòng)畫三:旋轉(zhuǎn)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(yù)載動(dòng)畫四:跳動(dòng)圈
這是一種墨西哥波浪紋的動(dòng)畫效果,通過設(shè)置不同圓圈之間的延遲參數(shù)來實(shí)現(xiàn)。
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(yù)載動(dòng)畫五:雷達(dá)圈
一種雷達(dá)輻射效果,給3個(gè)span elements設(shè)置相同的淡入淡出效果,再予每個(gè)稍微延遲下即可實(shí)現(xiàn)。
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;} }
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