css预加载

1、预备素材：

2、html元素：

    
  请稍侯.. 
    

3、css样式：

.mask-loading {
    width: 100%;
    min-height: 100%;
    text-align: center;
    top: 0;
    bottom: 0;
    position: fixed;
    opacity: 0.8;
    z-index: 100;
}
.new-loading {
    width: 3rem;
    height: 3.6rem;
    box-sizing: border-box;
    background: rgba(0, 0, 0, 0.6);
    overflow: hidden;
    border-radius: 5px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    padding-top: 2.7rem;
    line-height: 0.9rem;
    text-align: center;
    color: #fff;
    font-size: 0.6rem;
}
.new-loading:before {
    position: absolute;
    display: block;
    content: "";
    width: 100%;
    height: 2.7rem;
    left: 0;
    top: 0;
    background: url() no-repeat center center;
    background-size: 100%;
    animation: load 1s linear infinite;
    -webkit-animation: load 1s linear infinite;
}
@keyframes load {
		    0%{
		        transform:rotate(0deg);
		    }
		    50%{
		        transform:rotate(180deg);
		    }
		    100%{
		        transform:rotate(360deg);
		    }
		}
		@-webkit-keyframes load{
		    0%{
		        transform:rotate(0deg);
		    }
		    50%{
		        transform:rotate(180deg);
		    }
		    100%{
		        transform:rotate(360deg);
		    }
		}

4、相应的加载完成以后，隐藏该元素，适当的时候增加模板背景。