【构想】
CSS3 + JS
CSS3控制进度
利用CSS3中的 @keyframes
JS实现百分比
根据CSS来调整,时间
【页面代码】
第一种:
默认直接进入就是下载
CSS代码
body { background-color: #f5f7f9; color: #6c6c6c; font: 300 1em/1.5em; } .container { left: 50%; position: absolute; top: 40%; transform: translate(-50%, -50%); -webkit-transform: translate(-50%, -50%); } /* PROGRESS */ .progress { background-color: #e5e9eb; height: 0.25em; position: relative; width: 24em; } #progress-bar { animation-duration: 3s; animation-name: width; background-image: linear-gradient(to right, #4cd964, #5ac8fa, #007aff, #34aadc, #5856d6, #ff2d55); background-image: -webkit-linear-gradient(to right, #4cd964, #5ac8fa, #007aff, #34aadc, #5856d6, #ff2d55); background-size: 24em 0.25em; height: 100%; position: relative; } @keyframes width { 0%, 100% { transition-timing-function: cubic-bezier(1, 0, 0.65, 0.85); } 0% { width: 0; } 100% { width: 100%; } } .container .notice { animation: change 5s linear 0s infinite; font-size: 15px; margin: 10px; } @keyframes change { 0% { color: #4cd964; } 25% { color: #5ac8fa; } 50% { color: #007aff; } 75% { color: #5856d6; } 100% { color: #ff2d55; } }
HTML代码
<div class="container"> <div class="notice"id="notice"> 奴家,正在~客官不要急啦~(づ ̄ 3 ̄)づ </div> <div class="progress"> <div id="progress-bar"> </div> </div> </div>
JS代码
window.onload = function() { var progressBar = { //初始化 init: function() { var oBar = document.getElementById('progress-bar'); var oNotice = document.getElementById('notice'); var count = 0; //百分比计算,根据css的来 var timer = setInterval(function() { count++; oBar.innerHTML = count + '%'; if (count === 100) { oNotice.innerHTML = '客官,奴家好了~(✿◡‿◡)' clearInterval(timer); } }, 30); } }; progressBar.init(); }
第二种:
进入不下载,点击下载开始下载,暂停则暂停,原理控制setInterval和cleanInterval
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>进度条</title> <style type="text/css"> #pro { width: 0px; height: 20px; background-color: #cea; text-align: center; } </style> </head> <body> <button onclick="down()">下载</button> <button onclick="stop()">暂停</button> <br /> <div id="pro"></div> </body> <script> var count = 0; var tid; function Progress() { count++; if (count == 101) { Fn(); } else { var oPro = document.getElementById("pro") oPro.innerText = count + "%"; oPro.style.width = 3 * count + "px"; } } function down() { oStria = setInterval("Progress()", 100) } function stop(){ clearInterval(oStria) } function Fn() { clearInterval(oStria) alert("下载完成") } </script> </html>