mui 的loding 加载动画效果，

//扩展mui.showLoading
    //显示加载框
    var showLoading = function(message,type) {

            var html = '';
            html += '';
            html += '
' + (message || "数据加载中") + '
';

            //遮罩层
            var mask=document.getElementsByClassName("mui-show-loading-mask");
            if(mask.length==0){
                mask = document.createElement('div');
                mask.classList.add("mui-show-loading-mask");
                document.body.appendChild(mask);
                mask.addEventListener("touchmove", function(e){e.stopPropagation();e.preventDefault();});
            }else{
                mask[0].classList.remove("mui-show-loading-mask-hidden");
            }
            //加载框
            var toast=document.getElementsByClassName("mui-show-loading");
            if(toast.length==0){
                toast = document.createElement('div');
                toast.classList.add("mui-show-loading");
                toast.classList.add('loading-visible');
                document.body.appendChild(toast);
                toast.innerHTML = html;
                toast.addEventListener("touchmove", function(e){e.stopPropagation();e.preventDefault();});
            }else{
                toast[0].innerHTML = html;
                toast[0].classList.add("loading-visible");
            }
    };



//隐藏加载框
var hideLoading = function() {
    var mask=document.getElementsByClassName("mui-show-loading-mask");
    var toast=document.getElementsByClassName("mui-show-loading");
    if(mask.length>0){
        mask[0].classList.add("mui-show-loading-mask-hidden");
    }
    if(toast.length>0){
        toast[0].classList.remove("loading-visible");
    }
}

/*----------------mui.showLoading---------------*/
.mui-show-loading {
    position: fixed;
    padding: 5px;
    width: 120px;
    min-height: 120px;
    top: 45%;
    left: 50%;
    margin-left: -60px;
    background: rgba(0, 0, 0, 0.6);
    text-align: center;
    border-radius: 5px;
    color: #FFFFFF;
    visibility: hidden;
    margin: 0;
    z-index: 2000;

    -webkit-transition-duration: .2s;
    transition-duration: .2s;
    opacity: 0;
    -webkit-transform: scale(0.9) translate(-50%, -50%);
    transform: scale(0.9) translate(-50%, -50%);
    -webkit-transform-origin: 0 0;
    transform-origin: 0 0;
}
.mui-show-loading.loading-visible {
    opacity: 1;
    visibility: visible;
    -webkit-transform: scale(1) translate(-50%, -50%);
    transform: scale(1) translate(-50%, -50%);
}
.mui-show-loading .mui-spinner{
    margin-top: 24px;
    width: 36px;
    height: 36px;
}
.mui-show-loading .text {
    line-height: 1.6;
    font-family: -apple-system-font,"Helvetica Neue",sans-serif;
    font-size: 14px;
    margin: 10px 0 0;
    color: #fff;
}

.mui-show-loading-mask {
    position: fixed;
    z-index: 1000;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
}
.mui-show-loading-mask-hidden{
    display: none !important;
}