html5自定义遮罩的实现代码分享

.ys-loading{

    position:fixed;

    top:0;

    bottom:0;

    left:0;

    right:0;

    z-index: 9999;

}

.ys-loading em{

    position:absolute;

    left:0;

    right:0;

    top:0;

    bottom:0;

    width:44px;

    height:44px;

    margin:auto;

    border-radius: 22px;

    opacity: 0.3;

    overflow: hidden;

}

.ys-loading em:before{

    content:"";

    display:block;

    width:46px;

    height:46px;

    background:url(../../images/common/ajax-loader.gif) no-repeat center center;

    background-size:contain;

    margin-top:-1px;

    margin-left:-1px;

}