<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>进度条 </title>
</head>
<style>
#progress{
position: relative;
margin: auto;
top: 200px;
display: block;
width: 200px;
height: 20px;
border-style: dotted;
border-width: thin;
border-color: darkgreen;
}
#filldiv{
position:absolute;
top: 0px;
left: 0px;
width: 0px;
height: 20px;
background: blue;
}
#percent{
position: absolute;
top: 0px;
left: 200px;
}
</style>
<script src="common.js"></script>
<body>
<div id="progress">
<div id="filldiv"></div>
<span id="percent">0</span>
</div>
</body>
</html>
<script type="text/javascript">
let $progress = $('#progress')
let $filldiv = $('#filldiv');
let $percent = $('#percent');
$filldiv.style.width = 0;
let timer = setInterval(fn, 10);
function fn(){
$filldiv.style.background = getRandomColor();
console.log($filldiv.style.width,$progress.offsetWidth)
if(parseInt($filldiv.style.width) >= $progress.offsetWidth){
$filldiv.style.width = $progress.clientWidth + 'px';
clearInterval(timer);
}
$filldiv.style.width = parseInt($filldiv.style.width) + 1 + 'px';
$percent.innerHTML = parseInt((parseInt($filldiv.style.width) / $progress.clientWidth)*100)+ '%';
}
</script>// 判断数组是否还有这个元素
function include(arr, item) {
for(var i = 0; i < arr.length; i++) {
if(arr[i] === item) {
return true;
}
}
return false;
}
// 返回元素所在的位置
function indexOf(arr, item) {
for(var i = 0; i < arr.length; i++) {
if(arr[i] === item) {
return i;
}
}
return -1;
}
// 任意区间随机整数
function getRandom(max, min) {
min = min || 0;
if(min > max) {
var a = min;
min = max;
max = a;
}
return min + Math.floor(Math.random() * (max - min + 1));
}
// 数组去重
function noRepeat(arr) {
var __arr = [];
for(var i = 0; i < arr.length; i++) {
// 存在返回true, 不存在返回false
var bool = __arr.indexOf(arr[i])
if(bool == -1) {
__arr.push(arr[i]);
}
}
return __arr;
}
function $(ele) {
return document.querySelector(ele);
}
function $A(ele) {
return document.querySelectorAll(ele);
}
//获取随机颜色值
function getRandomColor() {
var str = '0123456789abcdef';
var color = '#';
for(var i = 0; i < 6; i++) {
color += str[getRandom(str.length - 1)];
}
return color;
}
// 格式化url, 获取参数
function parseUrl(url) {
var obj = {};
url = url.split('?')[1].split('#')[0];
url = url.split('&');
url.forEach(function (x) {
var arr = x.split('=');
obj[arr[0]] = arr[1];
})
return obj;
}
// 获取非行内样式
function getStyle(ele, attr) {
if(window.getComputedStyle) {
return window.getComputedStyle(ele, null)[attr]
}
return ele.currentStyle[attr];
}原文：https://www.cnblogs.com/web-learning/p/10492233.html