页面加载动画

此功能自别处转载！

废话不多说直接刚！

页面加载动画，在页面还未加载完成时会在页面显示动画，只有当页面所有元素全部加载完毕后才会显示页面。

HTML：

    

        

            loading...
        
    
    

        
    

CSS：

.loader {
    position: fixed;
    left: 50%;
    top: 50%;
    margin: -0.2em 0 0 -0.2em;
    text-indent: -9999em;
    border-top: 0.3em solid rgba(0, 0, 0, 0.1);
    border-right: 0.3em solid rgba(0, 0, 0, 0.1);
    border-bottom: 0.3em solid rgba(0, 0, 0, 0.1);
    border-left: 0.3em solid #555;
    -moz-transform: translateZ(0);
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    -moz-animation: loader 300ms infinite linear;
    -webkit-animation: loader 300ms infinite linear;
    animation: loader 300ms infinite linear;
    -moz-transition: all 500ms ease;
    -o-transition: all 500ms ease;
    -webkit-transition: all 500ms ease;
    transition: all 500ms ease;
}

.loader,
.loader:after {
    border-radius: 50%;
    width: 2em;
    height: 2em;
}

.curtain {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: white;
    -moz-transition: all 600ms ease;
    -o-transition: all 600ms ease;
    -webkit-transition: all 600ms ease;
    transition: all 600ms ease;
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    z-index: 0;
    overflow: hidden;
}

@-webkit-keyframes loader {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

@-moz-keyframes loader {
    0% {
        -moz-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -moz-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

@keyframes loader {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

.is-loading {
    overflow: hidden;
}

.is-loading .curtain {
    filter: progid:DXImageTransform.Microsoft.Alpha(enabled=false);
    opacity: 1;
    z-index: 99;
}

.is-loading .loader {
    filter: progid:DXImageTransform.Microsoft.Alpha(enabled=false);
    opacity: 1;
}

JS：