css3实现loading动画效果-原创手记-慕课网

通过css3动画实现三种loading加载动画
效果1：通过css3的border-radius与transform的rotate()实现
效果2：通过css3动画animation的animation-delay为负值，则直接从该时间状态进行动画的功能来实现
效果3：通过伪元素::bofore与::after,当animation过渡动画类型为ease时border重叠效果实现
<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no"/>
</head>
<style type="text/css">
    body {
        margin: 0px;
        /*background: black;*/
    }
    .loading {
        width: 100px;
        height: 100px;
        margin: 50px auto;
        border: 8px solid #333;
        border-left: 8px solid red;
        border-radius: 100px;
        -moz-animation: 2s loadings linear infinite;
        -webkit-animation: 2s loadings linear infinite;
        -ms-animation: 2s loading linear infinite;
        animation: 2s loadings linear infinite;
    }
    @-webkit-keyframes loadings {
        from {
            transform: rotate(0deg);
        }
        to {
            transform: rotate(360deg);
        }
    }
    @-moz-keyframes loadings {
        from {
            transform: rotate(0deg);
        }
        to {
            transform: rotate(360deg);
        }
    }
    @-ms-keyframes loadings {
        from {
            transform: rotate(0deg);
        }
        to {
            transform: rotate(360deg);
        }
    }
    @keyframes loadings {
        from {
            transform: rotate(0deg);
        }
        to {
            transform: rotate(360deg);
        }
    }

 .loading1 {
    margin: 0 auto;
    text-align: center;
    font-size: 0;
}
.loading1 .item {
    display: inline-block;
    margin-right: 5px;
    width: 5px;
    height: 45px;
    background-color: #000;
}
.loading1 .loading-item1 {
    -moz-animation: loading-animation 1.2s ease infinite;
    -webkit-animation: loading-animation 1.2s ease infinite;
    animation: loading-animation 1.2s ease infinite;
}
.loading1 .loading-item2 {
    -moz-animation: loading-animation 1.2s ease -1.1s infinite;
    -webkit-animation: loading-animation 1.2s ease -1.1s infinite;
    animation: loading-animation 1.2s ease -1.1s infinite;
}
.loading1 .loading-item3 {
    -moz-animation: loading-animation 1.2s ease -1.0s infinite;
    -webkit-animation: loading-animation 1.2s ease -1.0s infinite;
    animation: loading-animation 1.2s ease -1.0s infinite;
}
.loading1 .loading-item4 {
    -moz-animation: loading-animation 1.2s ease -0.9s infinite;
    -webkit-animation: loading-animation 1.2s ease -0.9s infinite;
    animation: loading-animation 1.2s ease -0.9s infinite;
}
.loading1 .loading-item5 {
    -moz-animation: loading-animation 1.2s ease -0.8s infinite;
    -webkit-animation: loading-animation 1.2s ease -0.8s infinite;
    animation: loading-animation 1.2s ease -0.8s infinite;
}
@-webkit-keyframes loading-animation {
    0%,
    40%,
    100%{
        -webkit-transform: scaleY(0.5);
    }
    20% {
        -webkit-transform: scaleY(1);
    }
}
@-moz-keyframes loading-animation {
    0%,
    40%,
    100%{
        -moz-transform: scaleY(0.5);
    }
    20% {
        -moz-transform: scaleY(1);
    }
}
@-ms-keyframes loading-animation {
    0%,
    40%,
    100%{
        -ms-transform: scaleY(0.5);
    }
    20% {
        -ms-transform: scaleY(1);
    }
}
@keyframes loading-animation {
    0%,
    40%,
    100%{
        transform: scaleY(0.5);
    }
    20% {
        transform: scaleY(1);
    }
}    

        .loading3 {
            position: relative;
            margin: 0 auto;
            width: 100px;
            height: 100px;
            border: 5px solid red;
            border-radius: 50%;
        }
        .loading3::before {
            content: "";
            position: absolute;
            display: inline-block;
            top: -5px;
            left: -5px;
            width: 50px;
            height: 100px;
            border-radius: 150px 0 0 150px;
            border-left: 5px solid black;
            border-bottom: 5px solid black;
            border-top: 5px solid black;
            -webkit-transform-origin: 60px 60px;
            -moz-transform-origin: 60px 60px;
            -ms-transform-origin: 60px 60px;
            transform-origin: 55px 55px;
            -webkit-animation: loading3 4s ease infinite -3s;
            -moz-animation: loading3 4s ease infinite -3s;
            -ms-animation: loading3 4s ease infinite -3s;
            animation: loading3 4s ease infinite -3s;
        }
        .loading3::after {
            content: "";
            position: absolute;
            display: inline-block;
            top: -5px;
            left: 50px;
            width: 50px;
            height: 100px;
            border-radius: 0 150px 150px 0;
            border-top: 5px solid black;
            border-right: 5px solid black;
            border-bottom: 5px solid black;
            -webkit-transform-origin: 0;
            -moz-transform-origin: 0;
            -ms-transform-origin: 0;
            transform-origin: 0;
            -webkit-animation: loading3 4s ease infinite;
            -moz-animation: loading3 4s ease infinite;
            -ms-animation: loading3 4s ease infinite;
            animation: loading3 4s ease infinite;
        }
        @-webkit-keyframes loading3 {
            0%{
                -webkit-transform: rotate(0);
            }
            100% {
                -webkit-transform: rotate(360deg);
            }
        }
        @-moz-keyframes loading3 {
            0%{
                -moz-transform: rotate(0);
            }
            100% {
                -moz-transform: rotate(360deg);
            }
        }
        @-ms-keyframes loading3 {
            0%{
                -ms-transform: rotate(0);
            }
            100% {
                -ms-transform: rotate(360deg);
            }
        }
        @keyframes loading3 {
            0%{
                transform: rotate(0);
            }
            100% {
                transform: rotate(360deg);
            }
        }
</style>
<body>
    <div class="loading"></div>

    <div class="loading1">
        <span class="item loading-item1"></span>
        <span class="item loading-item2"></span>
        <span class="item loading-item3"></span>
        <span class="item loading-item4"></span>
        <span class="item loading-item5"></span>
    </div>

    <div class="loading3"></div>
</body>
</html>