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H5+JS implements page loading animation

青灯夜游forward: 2021-01-27 19:12:145246browse

This article will introduce to you how to implement page loading animation in HTML5 JavaScript. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

(Related tutorial recommendations: html tutorial)

1. Use a timer and wait every time.

2. Determine whether the loading animation will exit based on whether the page loading is completed.

<script>
        document.onreadystatechange=function(){
            console.log(document.readyState);
            if(document.readyState=="complete"){
                $(".loading").fadeOut();
            }
        }        
     </script>

3. Both of the above are directly using gif images. In order to make the web page load faster, use css3 to create playback animations

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>CSS3进度条</title>
    <style>
            .loading{width:100%; height: 100%;position: fixed;top:0;left: 0;z-index: 100;background: #ffffff;}
            .loading .pic{
            width: 64px;
            height: 64px;
            /* background: url(images/loading.gif); */
            position: absolute;
            top: 0;
            bottom: 0;
            left:0;
            right:0;
            margin: auto}
 
            .loading .pic i{
                display: block;
                float: left;
                width: 6px;
                height: 50px;
                background: #399;
                margin: 0 2px;
                transform: scaleY(0.4);
                animation: load 1.2s infinite;
            }
            .loading .pic i:nth-child(1){animation-delay:0.1s }
            .loading .pic i:nth-child(2){animation-delay:0.2s }
            .loading .pic i:nth-child(3){animation-delay:0.3s }
            .loading .pic i:nth-child(4){animation-delay: 0.4s}
            .loading .pic i:nth-child(5){animation-delay:0.5s }
 
            @keyframes load{
                0%,40%,100%{transform: scaleY(0.4)}
                20%{transform:scaleY(1) }
            }
    </style>
</head>
<body>
        
        <div>
            <div>
                <i></i>
                <i></i>
                <i></i>
                <i></i>
                <i></i>
            </div>
        </div>
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt=""/>
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt=""/>
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt=""/>
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt=""/>
</body>
</html>

The effect is as follows

H5+JS implements page loading animation

4. Based on the page loading progress in real time, the loading percentage is displayed

<!DOCTYPE html>
<html>
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>实时获取加载数据的进度条</title>
    <style>
        .loading {
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 100;
            background: #ffffff;
        }
 
        .loading .pic {
            width: 100px;
            height: 100px;
            /* background: url(images/loading.gif); */
            position: absolute;
            top: 0;
            bottom: 0;
            left: 0;
            right: 0;
            margin: auto;
            /* border: 1px solid red; */
            font-size: 30px;
            text-align: center;
            line-height: 100px;
        }
 
        .loading .pic span{
            display: block;
            width: 80px;
            height: 80px;
            position: absolute;
            top:10px;
            left: 10px;
            border-radius: 50%;
            box-shadow: 0 3px 0 #666;
            animation: rotate 1s infinite linear;
        }
        @keyframes rotate{
            0%{transform: rotate(0deg);}
            100%{transform: rotate(360deg);}
        }
            
    </style>
    <script src="http://code.jquery.com/jquery-1.6.4.min.js"></script>
    <script>
         $(function(){
             var img=$("img");
             var num=0;
             img.each(function(i){
                 var oImg=new Image();
 
                 oImg.onload=function(){
                     oImg.onload=null;
                     num++;
                     $(".loading b").html(parseInt( num/$("img").size()*100)+"%");
                     if(num>=i){
                         $(".loading").fadeOut();
                     }
                 }
                 oImg.src=img[i].src;
             });       
    })
 
 
    </script>
</head>
 
<body>
    <div>
        <div>
            <span></span>
            <b>0%</b>
        </div>
    </div>
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt="" />
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt="" />
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt="" />
    <img src="http://i1.hdslb.com/bfs/archive/763293ce06bf1e684ef0ea3da43ae5008d8564b8.jpg" alt="" />
</body>
 
</html>

The effect is as follows. Because the loading is too fast, a screenshot of the initial page of the animation is taken.

H5+JS implements page loading animation

The style code written can be found at this URL, http://autoprefixer.github.io/ to help us automatically adapt to different browsers.

H5+JS implements page loading animation

For more programming related knowledge, please visit: Programming Video! !

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