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图片预加载之无序预加载

2024-09-21 12:07:11   217人阅读

图片预加载之无序预加载

废话不多说，直接上图。

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<!DOCTYPE html><html lang="zh-CN"><head>    <meta charset="UTF-8">    <title>PreLoading</title>    <style>        *{margin:0; padding:0; border:none; outline:0; text-decoration:none;}        html,body,.box{width:100%; height:100%;}        .box{display:none;}        #img{width:90%; height:90%; margin:2vh auto 0; display:block; box-shadow:0 0 10px gray;}        .box .btns{width:140px; height:40px; display:block; margin:20px auto;}        .box .btns .btn{width:60px; height:40px; display:block; border:1px gray solid; background-color:#ccc; text-align:center; line-height:40px; float:left;}        .box .btns .btn:nth-of-type(2){margin-left:16px;}        .load{width:100%; height:100%; display:block; font-size:60px; font-family:"微软雅黑"; color:#ccc; text-align:center; line-height:100vh; position:fixed;}    </style></head><body>    <div class="box">        <img id="img" src="" alt="pic">        <p class="btns"><a href="javascript:" class="btn">prev</a><a href="javascript:" class="btn">next</a></p>    </div>    <p class="load">0%</p>    <script type="text/javascript">

        var imgs = [‘http://down.699pic.com/photo/50036/7661.jpg?_upt=da51378d1494571758&_upd=500367661.jpg‘,                    ‘http://desk.fd.zol-img.com.cn/t_s1920x1080c5/g5/M00/09/0F/ChMkJljskIqIPX9bAAMPyuIn8DcAAbj8QB7XpYAAw_i343.jpg‘,                    ‘http://desk.fd.zol-img.com.cn/t_s1920x1080c5/g5/M00/09/0F/ChMkJljskLeIaW-JAAIudN_yqvgAAbj8gDQO5AAAi6M64.jpeg‘,                    ‘http://desk.fd.zol-img.com.cn/t_s1920x1080c5/g5/M00/0F/08/ChMkJlauzISIH0uXAARUHuJLVX8AAH8-gHu6zsABFQ2166.jpg‘,                    ‘http://desk.fd.zol-img.com.cn/t_s1920x1080c5/g5/M00/0F/08/ChMkJlauzISIIL5TAAObxg4-XeUAAH8-gHzP3EAA5ve000.jpg‘];                // 绑定按钮事件        var btns = document.getElementsByClassName(‘btn‘),            img = document.getElementById(‘img‘),            index = 0;        for(var i=0;i<btns.length;i++){            btns[i].onclick = function(){                if(this.innerHTML === ‘next‘){                    index = Math.min(++index , imgs.length-1);                    img.setAttribute(‘src‘,imgs[index]);                }                if(this.innerHTML === ‘prev‘){                    index = Math.max(--index , 0);                    img.setAttribute(‘src‘,imgs[index]);                }            }        }        // 计数变量        var count = 0,            load = document.getElementsByClassName(‘load‘)[0],            box = document.getElementsByClassName(‘box‘)[0];        // 无序预加载                for(var i=0;i<imgs.length;i++){            (function(i){                var imgObj = new Image();            imgObj.onload = function(){                    load.innerHTML = Math.round((count + 1) / imgs.length * 100) + ‘%‘;                    count++;                    if(count >= imgs.length-1){                        load.style.display = ‘none‘;                        box.style.display = ‘block‘;                        img.setAttribute(‘src‘,imgs[0]);                        document.title = ‘1/‘ + imgs.length;                    }                }            imgObj.onerror = function(){                    load.innerHTML = Math.round((count + 1) / imgs.length * 100) + ‘%‘;                    count++;                    if(count >= imgs.length-1){                        load.style.display = ‘none‘;                        box.style.display = ‘block‘;                        img.setAttribute(‘src‘,imgs[0]);                        document.title = ‘1/‘ + imgs.length;                    }                }                imgObj.src = imgs[i];            })(i);        }    </script></body></html>

 

图片预加载之无序预加载


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