纯css3实现正在加载动画

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>加载动画</title>

    <style>
        /*
             加载动画.html css
        */
        #load_bg {
            width: 100%;
            height: 100%;
            position: fixed;
            background: rgba(0, 0, 0, 0.3);
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1;
        }
        .load_box {
            width: 200px;
            height: 200px;
            position: fixed;
            left: 50%;
            top: 50%;
            margin: 0 auto;
            z-index: 2;
            margin-top: -100px;
            margin-left: -100px;
        }
        .load_box > .load {
            align-items: center;
            justify-content: center;
        }
        .load_box > .load > .loading > i {
            display: inline-block;
            width: 5px;
            height: 30px;
            border-radius: 3px;
            background: #333;
            margin: 0 3px;
        }
        .load_box > .load > .loading > i:nth-child(1) {
            animation: loading-2 1s linear 0s infinite;
            -o-animation: loading-2 1s linear 0s infinite;
            -moz-animation: loading-2 1s linear 0s infinite;
            -webkit-animation: loading-2 1s linear 0s infinite;
        }
        .load_box > .load > .loading > i:nth-child(2) {
            animation: loading-2 1s ease-in 0.2s infinite;
            -o-animation: loading-2 1s ease-in 0.2s infinite;
            -moz-animation: loading-2 1s ease-in 0.2s infinite;
            -webkit-animation: loading-2 1s ease-in 0.2s infinite;
        }
        .load_box > .load > .loading > i:nth-child(3) {
            animation: loading-2 1s ease-in 0.4s infinite;
            -o-animation: loading-2 1s ease-in 0.4s infinite;
            -moz-animation: loading-2 1s ease-in 0.4s infinite;
            -webkit-animation: loading-2 1s ease-in 0.4s infinite;
        }
        .load_box > .load > .loading > i:nth-child(4) {
            animation: loading-2 1s ease-in 0.8s infinite;
            -o-animation: loading-2 1s ease-in 0.8s infinite;
            -moz-animation: loading-2 1s ease-in 0.8s infinite;
            -webkit-animation: loading-2 1s ease-in 0.8s infinite;
        }
        .load_box > .load > .loading > i:nth-child(5) {
            animation: loading-2 1s ease-in 1s infinite;
            -o-animation: loading-2 1s ease-in 1s infinite;
            -moz-animation: loading-2 1s ease-in 1s infinite;
            -webkit-animation: loading-2 1s ease-in 1s infinite;
        }
        @-webkit-keyframes loading-2 {
            0% {
                transform: scaleY(1);
                -o-transform: scaleY(1);
                -ms-transform: scaleY(1);
                -moz-transform: scaleY(1);
                -webkit-transform: scaleY(1);
            }
            50% {
                transform: scaleY(0.4);
                -o-transform: scaleY(0.4);
                -ms-transform: scaleY(0.4);
                -moz-transform: scaleY(0.4);
                -webkit-transform: scaleY(0.4);
            }
            100% {
                transform: scaleY(1);
                -o-transform: scaleY(1);
                -ms-transform: scaleY(1);
                -moz-transform: scaleY(1);
                -webkit-transform: scaleY(1);
            }
        }
    </style>
</head>
<body style="background: #fff">

<!--遮罩层开始-->
<div id="load_bg"></div>
<div class="load_box">
    <div class="load">
        <div class="loading">
            <i></i>
            <i></i>
            <i></i>
            <i></i>
            <i></i>
        </div><!-- ./loading end-->
    </div><!--./load end-->

</div><!--./box end-->

</body>
</html>
纯css3实现 正在加载 动画

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