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利用純css3實現圓形從中心向四周擴散動畫效果代碼

高洛峰
高洛峰原創
2017-03-16 10:13:462832瀏覽

先來個簡單的範例,例如:

@keyframes hovertreemove
{
from {top:30px;}
to {top:130px;}
}

效果:
http://hovertree.com/texiao/css3/37/1 .htm

可以透過@keyframes 規則,建立動畫

創建動畫的原理是,將一套 CSS 樣式逐漸改變為另一套樣式。
在動畫過程中,您能夠多次改變這套 CSS 樣式。
以百分比來規定改變發生的時間,或透過關鍵字 "from" 和 "to",等價於 0% 和 100%。
0% 是動畫的開始時間,100% 動畫的結束時間。
為了獲得最佳的瀏覽器支持,您應該始終定義 0% 和 100% 選擇器。

以下為上下移動的程式碼:


<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>css3使用animation和@keyframes制作动画_何问起</title>
    <meta charset="utf-8" />
    <style>@keyframes hovertreemove{from {top:30px;}to {top:130px;}}
#hovertreekf{
    width:80px;height:80px;
    border:1px solid red;
    position:absolute;
    background:url(http://hovertree.com/themes/hvtimages/smile.png) no-repeat center;
    animation:hovertreemove /*动画样式名称*/
        1s /*动画时间*/
    linear /*线性运动*/
        infinite /*无限播放*/
        alternate/*往返动画*/;}
  a{color:blue;text-decoration:none;}  </style></head><body><a href="http://hovertree.com/h/bjaf/i309b77d.htm" target="_blank">说明</a>
    <p id="hovertreekf"></p></body></html>

以下為圓形擴散運動的程式碼:


<!DOCTYPE html><html><head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>纯css3圆形从中心向四周扩散动画效果_何问起</title>
    <style>
        @keyframes warn {
            0% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.0;
            }

            25% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.1;
            }

            50% {
                transform: scale(0.5);
                -webkit-transform: scale(0.5);
                opacity: 0.3;
            }

            75% {
                transform: scale(0.8);
                -webkit-transform: scale(0.8);
                opacity: 0.5;
            }

            100% {
                transform: scale(1);
                -webkit-transform: scale(1);
                opacity: 0.0;
            }
        }

        @keyframes warn1 {
            0% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.0;
            }

            25% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.1;
            }

            50% {
                transform: scale(0.3);
                -webkit-transform: scale(0.3);
                opacity: 0.3;
            }

            75% {
                transform: scale(0.5);
                -webkit-transform: scale(0.5);
                opacity: 0.5;
            }

            100% {
                transform: scale(0.8);
                -webkit-transform: scale(0.8);
                opacity: 0.0;
            }
        }

        .container {
            position: relative;
            width: 40px;
            height: 40px;
            /*border: 1px solid #000; hovertree.com */
        }
        /* 保持大小不变的小圆圈 何问起 */
        .dot {
            position: absolute;
            width: 92px;
            height: 92px;
            left: 120px;
            top: 120px;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border: 2px solid red;
            border-radius: 50%;
            z-index: 2;
        }
        /* 产生动画(向外扩散变大)的圆圈  */
        .pulse {
            position: absolute;
            width: 320px;
            height: 320px;
            left: 2px;
            top: 2px;
            border: 6px solid red;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border-radius: 50%;
            z-index: 1;
            opacity: 0;
            -webkit-animation: warn 2s ease-out;
            -moz-animation: warn 2s ease-out;
            animation: warn 2s ease-out;
            -webkit-animation-iteration-count: infinite;
            -moz-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
            box-shadow: 1px 1px 30px red;
        }

        .pulse1 {
            position: absolute;
            width: 320px;
            height: 320px;
            left: 2px;
            top: 2px;
            border: 6px solid red;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            border-radius: 50%;
            z-index: 1;
            opacity: 0;
            -webkit-animation: warn1 2s ease-out;
            -moz-animation: warn1 2s ease-out;
            animation: warn1 2s ease-out;
            -webkit-animation-iteration-count: infinite;
            -moz-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
            box-shadow: 1px 1px 30px red;
        }a{color:blue;text-decoration:none;}
    </style></head><body><a href="http://hovertree.com/h/bjaf/i309b77d.htm" target="_blank">说明</a>
    <p class="container">
        <p class="dot"></p>
        <p class="pulse"></p>
        <p class="pulse1"></p>
    </p></body></html>

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