loading效果

效果图如下：

    <div class="loading">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>

.loading {
    width: 50px;
    height: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.loading span {
    width: 8px;
    height: 8px;
    background-color: #3B27B8;
    position: absolute;
    border-radius: 50%;
    -webkit-animation: LoadAni 1.04s ease infinite;
    animation: LoadAni 1.04s ease infinite;
}

@-webkit-keyframes LoadAni {
    0% {
        -webkit-transform: scale(1.2);
        opacity: 1;
    }

    100% {
        -webkit-transform: scale(.3);
        opacity: 0.5;
    }
}

@keyframes LoadAni {
    0% {
        -webkit-transform: scale(1.2);
        opacity: 1;
    }

    100% {
        -webkit-transform: scale(.3);
        opacity: 0.5;
    }
}

.loading span:nth-child(1) {
    left: 0;
    top: 50%;
    margin-top: -4px;
    -webkit-animation-delay: 0.13s;
    animation-delay: 0.13s;
}

.loading span:nth-child(2) {
    left: 5px;
    top: 5px;
    -webkit-animation-delay: 0.26s;
    animation-delay: 0.26s;
}

.loading span:nth-child(3) {
    left: 50%;
    top: 0;
    margin-left: -4px;
    -webkit-animation-delay: 0.39s;
    animation-delay: 0.39s;
}

.loading span:nth-child(4) {
    right: 5px;
    top: 5px;
    -webkit-animation-delay: 0.52s;
    animation-delay: 0.52s;
}

.loading span:nth-child(5) {
    right: 0;
    top: 50%;
    margin-top: -4px;
    -webkit-animation-delay: 0.65s;
    animation-delay: 0.65s;
}

.loading span:nth-child(6) {
    right: 5px;
    bottom: 5px;
    -webkit-animation-delay: 0.78s;
    animation-delay: 0.78s;
}

.loading span:nth-child(7) {
    left: 50%;
    bottom: 0;
    margin-left: -4px;
    -webkit-animation-delay: 0.91s;
    animation-delay: 0.91s;
}

.loading span:nth-child(8) {
    left: 5px;
    bottom: 5px;
    -webkit-animation-delay: 1.04s;
    animation-delay: 1.04s;
}