Simple loading animation

style

.page-loading{
    
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 9999;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
}
.page-loading-div{
    
    width: 100%;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 0;
    margin-top: -50px;
}
.page-loading-box{
    
    width: 100px;
    height: 100px;
    line-height: 100px;
    font-size: 80px;
    color: rgba(255,255,255,0.4);
    text-align: center;
    margin: 0 auto;
    border-radius: 100px;
    overflow: hidden;
    opacity: 0.8;
    position: relative;
    background-color: rgba(255,255,255,0.2);
}
.page-loading-box .glyphicon{
    
    line-height: 100px;
    animation-name: rotate360;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: normal;
    animation-duration: 1.4s;
}
.page-loading-text{
    
    line-height: 100px;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    font-size: 14px;
    color: #fff;
    text-align: center;
}
.page-loading-text>span{
    
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: normal;
    animation-duration: 2s;
}
.page-loading-text>span:nth-of-type(1){
    
    animation-name: pointShine1;
}
.page-loading-text>span:nth-of-type(2){
    
    animation-name: pointShine2;
}
.page-loading-text>span:nth-of-type(3){
    
    animation-name: pointShine3;
}

@keyframes rotate360 {
    
    0%{
    
        transform: rotate(0);
    }
    50%{
    
        transform: rotate(180deg);
    }
    100%{
    
        transform: rotate(360deg);
    }
}

@keyframes pointShine1 {
    
    0% {
    
        opacity: 0;
    }
    32% {
    
        opacity: 1;
    }
    96% {
    
        opacity: 1;
    }
    100% {
    
        opacity: 0;
    }
}

@keyframes pointShine2 {
    
    0% {
    
        opacity: 0;
    }
    32% {
    
        opacity: 0;
    }
    64% {
    
        opacity: 1;
    }
    96% {
    
        opacity: 1;
    }
    100% {
    
        opacity: 0;
    }
}

@keyframes pointShine3 {
    
    0% {
    
        opacity: 0;
    }
    64% {
    
        opacity: 0;
    }
    96% {
    
        opacity: 1;
    }
    100% {
    
        opacity: 0;
    }
}

Code class

/** * loading Animation  */
 function Loading() {
    
   this.loadings = [];
   // this.loadingHtml = '<div class="page-loading">'
   this.loadingHtml = '<div class="page-loading-div">'
   + '<div class="page-loading-box">'
    + '<i class="glyphicon glyphicon-refresh"></i>'
    + '<div class="page-loading-text"> Loading <span>.</span><span>.</span><span>.</span></div>'
   + '</div>'
   + '</div>'
   // + '</div>';
}

Loading.prototype.doLoading = function(){
    
    let code = Math.floor(Math.random() * 100000);

    this.loadings.push(code);

    let bodyDom = document.getElementsByTagName('body');
    if(bodyDom.length > 0){
    
        let childsDoms = bodyDom[0].childNodes;
        let isInsert = false;
        if(childsDoms && childsDoms.length > 0){
    
            for(var i = 0; i< childsDoms.length; i++){
    
                let childDom = childsDoms[i];
                let className = childDom && childDom.className;
                className = className != null && className != undefined ? className : '';
                if(className.indexOf('page-loading') >= 0){
    
                    isInsert = true;
                }
            }
        }
        if(!isInsert){
    
            var DIV = document.createElement("DIV");
            DIV.className = 'page-loading';
            DIV.innerHTML = this.loadingHtml;
            bodyDom[0].appendChild(DIV);
        }
    }

    return code;
}

Loading.prototype.removeLoadingDom = function() {
    
    let bodyDom = document.getElementsByTagName('body');
    if(bodyDom.length > 0){
    
        let childsDoms = bodyDom[0].childNodes;
        if(childsDoms && childsDoms.length > 0){
    
            for(var i = 0; i< childsDoms.length; i++){
    
                let childDom = childsDoms[i];
                // console.log(childDom, childDom.className);
                let className = childDom && childDom.className;
                className = className != null && className != undefined ? className : '';
                if(className.indexOf('page-loading') >= 0){
    
                    bodyDom[0].removeChild(childDom);
                }
            }
        }
    }
}

Loading.prototype.closeLoading = function(code){
    
    let {
     loadings } = this;
    if(loadings && loadings.length > 0){
    
        let index = loadings.indexOf(code);
        if(index > -1){
    
            loadings.splice(index, 1);
        }
    }

    if(loadings && loadings.length == 0){
    
        this.removeLoadingDom();
    }
}

Loading.prototype.closeAllLoading = function() {
    
    this.loadings = [];

    this.removeLoadingDom();
}

Loading.prototype.getLoadings = function() {
    
    let {
     loadings } = this;
    return loadings && loadings.length > 0 ? loadings : [];
}

Loading.prototype.checkIsInLoading = function(code){
    
    let {
     loadings } = this;
    return loadings && loadings.length > 0 && loadings.indexOf(code) > -1;
}

Use

let loading  = new Loading();

let loadCode = loading.doLoading();
setTimeout(function() {
    
	loading.closeLoading(loadCode);
}, 2000)

effect