• 网页加载进度的实现--JavaScript基础


    总结了一些网页加载进度的实现方式……

    1、定时器实现加载进度

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>定时器实现进度条</title>
      <style>
      *{margin:0;padding:0}
      .loading{ 100%;height: 100%;position: fixed;left: 0;top:0;z-index: 100;background-color: white;}
      .loading .pic{64px;height:64px;background-image: url("images/loading.gif");position: absolute;
      left: 0;top:0;bottom:0;right: 0;margin: auto;}
      </style>
      <script src="js/jquery-3.2.1.min.js"></script>
    </head>
    <body>
      <div class="loading">
      <div class="pic"></div>
      </div>
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </body>
    <script>
      $(function () {
        setInterval(function () {
          $('.loading').fadeOut();
        },3000)
      })

      // var load = '<div class="loading"> <div class="pic"></div> </div>';
      // $('body').append(load);
      // $(function () {
      // setInterval(function () {
      // $('.loading').fadeOut();
      // },3000)
      // })

    </script>
    </html>

    效果图:

    2、通过加载状态事件实现加载进度

    readyState定义和用法:

     

    readyState 属性返回当前文档的状态(载入中……)。

     

    该属性返回以下值:

     

    • uninitialized - 还未开始载入

    • loading - 载入中

    • interactive - 已加载,文档与用户可以开始交互

    • complete - 载入完成

     

    语法:document.readyState

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>通过加载状态事件来实现加载进度</title>
      <style>
      *{margin:0;padding:0}
      .loading{ 100%;height: 100%;position: fixed;left: 0;top:0;z-index: 100;background-color: white;}
      .loading .pic{64px;height:64px;background-image: url("images/loading.gif");position: absolute;left: 0;top:0;bottom:0;right: 0;margin: auto;}
      </style>
      <script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
      <script>
        document.onreadystatechange = function () {
          if(document.readyState == 'complete'){
          $('.loading').fadeOut();
          }
        }
      </script>
    </head>
    <body>
      <div class="loading"> <div class="pic"></div></div>
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </body>
    </html>

    效果图:

    3、加载状态事件结合css3进度条动画实现加载进度

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>css3进度条动画</title>
      <style>
      *{margin:0;padding:0}
      .loading{ 100%;height: 100%;position: fixed;left: 0;top:0;z-index: 100;background-color: white;}
      .loading .pic{50px;height:50px;position: absolute;left: 0;top:0;bottom:0;right: 0;margin: auto;}
      .loading .pic i{display: block; 6px;height: 50px;background-color: #399;float: left;margin: 0 2px;
    -webkit-transform: scaleY(0.4);-ms-transform: scaleY(0.4);transform: scaleY(0.4);-webkit-animation: loading 1.2s infinite;animation: loading 1.2s infinite
      }
      .loading .pic i:nth-child(1){}
      .loading .pic i:nth-child(2){-webkit-animation-delay: 0.1s;animation-delay: 0.1s}
      .loading .pic i:nth-child(3){-webkit-animation-delay: 0.2s;animation-delay: 0.2s}
      .loading .pic i:nth-child(4){-webkit-animation-delay: 0.3s;animation-delay: 0.3s}
      .loading .pic i:nth-child(5){-webkit-animation-delay: 0.4s;animation-delay: 0.4s}
      @-webkit-keyframes loading {
      0%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      20%{-webkit-transform: scaleY(1);transform: scaleY(1)}
      50%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      100%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      }
      @keyframes loading {
      0%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      20%{-webkit-transform: scaleY(1);transform: scaleY(1)}
      50%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      100%{-webkit-transform: scaleY(0.4);transform: scaleY(0.4)}
      }
    </style>
    </head>
    <body>
      <script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
      <script>
        document.onreadystatechange = function () {
          if(document.readyState == 'complete'){
            $('.loading').fadeOut();
          }
        }
      </script>
      <div class="loading">
      <div class="pic">
        <i></i>
        <i></i>
        <i></i>
        <i></i>
        <i></i>
      </div>
      </div>
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </body>
    </html>
    效果图

    4、通过定位在头部的进度条实现加载的进度

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>定位在头部的进度条</title>  
      <style>
        *{padding: 0;margin: 0;}
        .loading{ 100%;height: 100%;position: fixed;left: 0;top:0;z-index: 100;background-color: white;}
        .loading .pic{0;height:4px;position: absolute;left: 0;top:0;background-color: #f33;}
      </style>
    </head>
    <body>
      <div class="loading"> <div class="pic"></div></div>
      <script src="http://code.jquery.com/jquery-3.2.1.min.js"></script>
    <header>
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </header>
    <script>
      $(".loading .pic").animate({'30%'},100)
    </script>
    <section class="banner">
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </section>
    <script>
      $(".loading .pic").animate({'30%'},100)
    </script>
    <section class="aboout">
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </section>
    <script>
      $(".loading .pic").animate({'50%'},100)
    </script>
    <section class="pro">
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </section>
    <script>
      $(".loading .pic").animate({'70%'},100)
    </script>
    <section class="new">
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </section>
    <script>  
      $(".loading .pic").animate({'90%'},100)
    </script>
    <footer>
      <img src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=429122487,3210940336&fm=200&gp=0.jpg">
      <img src="https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1517729420,3900474631&fm=27&gp=0.jpg">
    </footer>
    <script>
      $(".loading .pic").animate({'100%'},100,function () {
      $(".loading").fadeOut();
      })
    </script>
    </body>
    </html>
    效果图:

    5、通过实时获取加载数据实现加载进度

    建立图像对象:图像对象名称 = new Image();

    属性:border complete height

    事件:onload onerror onkeydown okeypress……

    src属性要写到onload后面,否则程序在IE中会出错。

    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>实时获取加载数据实现加载进度</title>

      <style>
        *{padding: 0;margin: 0;}
        .loading{ 100%;height: 100%;position: fixed;left: 0;top:0;z-index: 100;background-color: white;}
        .loading .pic{80px;height:80px;position: absolute;left: 0;top:0;right:0;bottom:0;margin:auto;text-align: center;}
        .loading .pic span{ 60px;height: 60px; position: absolute;left: 10px;top:10px;
        border-radius: 50%;box-shadow: 0 3px 0 #666;animation: rotate 0.5s infinite linear;-webkit-animation:rotate 0.5s infinite linear}
        .loading .pic b{font-size: 25px;line-height: 80px;}
        @keyframes rotate {
          0%{transform: rotate(0deg);}
          100%{transform: rotate(360deg);}
         }
        @-webkit-keyframes {
          0%{-webkit-transform: rotate(0deg);}
          100%{-webkit-transform: rotate(360deg);}
         }
    </style>
    <script src="js/jquery-3.2.1.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++;
          $('.loading .pic b').html(parseInt(num/$('img').length*100))+"%";
          if (num >= i) {//判断所有图像加载完成的条件
            $('.loading').fadeOut();
            }
          };
        oImg.src=img[i].src;

        })

      })
    </script>
    </head>
    <body>
    <div class="loading">
      <div class="pic">
        <span></span>
        <b>0%</b>
      </div>
    </div>
      <img src="http://i03.pic.sogou.com/45ae2054bc16d73a">
      <img src="http://i03.pic.sogou.com/fa3820a0be251630">
      <img src="http://i04.pic.sogou.com/2ea901dbf2999081">
      <img src="http://i03.pic.sogou.com/a53bcd45218a7330">
      <img src="http://i03.pic.sogou.com/9a9e8866b05cf32f">
      <img src="http://i03.pic.sogou.com/45ae2054bc16d73a">
      <img src="http://i03.pic.sogou.com/fa3820a0be251630">
      <img src="http://i04.pic.sogou.com/2ea901dbf2999081">
      <img src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1863935812,3262346880&fm=27&gp=0.jpg">
      <img src="https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=164104570,3489576029&fm=27&gp=0.jpg">
    </body>
    </html>

    效果图:

    源码文件下载:网页加载进度的实现.zip

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  • 原文地址:https://www.cnblogs.com/qikeyishu/p/7637773.html
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