JS实现环形进度条（从0到100%）效果
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最近公司项目中要用到这种类似环形进度条的效果，初始就从0开始动画到100%结束。动画结果始终会停留在100%上，并不会到因为数据的关系停留在一半。
如图
代码如下
demo.html
<!doctype html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
<style>
.rad-prg{
position: relative;
}
.rad-con{
position: absolute;
z-index: 1;
top:0;
left: 0;
text-align: center;
width:90px;
height: 90px;
padding: 10px;
font-family: "microsoft yahei";
}
</style>
</head>
<body>
<div class="prg-cont rad-prg" id="indicatorContainer">
<div class="rad-con">
<p>￥4999</p>
<p>账户总览</p>
</div>
</div>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery.min.js">
radialIndicator.js 这是jquery的插件
/*
radialIndicator.js v 1.0.0
Author: Sudhanshu Yadav
Copyright (c) 2015 Sudhanshu Yadav - ignitersworld.com , released under the MIT license.
Demo on: ignitersworld.com/lab/radialIndicator.html
*/
;(function ($, window, document) {
"use strict";
//circumfence and quart value to start bar from top
var circ = Math.PI * 2,
quart = Math.PI / 2;
//function to convert hex to rgb
function hexToRgb(hex) {
// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
var shorthandRegex = /^#"").reverse(),
i = 0,
lastHashReplaced = 0;
//changes hash with numbers
for (var ln = output.length; i < ln; i++) {
if (!numRev.length) break;
if (output[i] == "#") {
lastHashReplaced = i;
output[i] = numRev.shift();
}
}
//add overflowing numbers before prefix
output.splice(lastHashReplaced+1, output.lastIndexOf('#') - lastHashReplaced, numRev.reverse().join(""));
return output.reverse().join('');
}
}
//circle bar class
function Indicator(container, indOption) {
indOption = indOption || {};
indOption = merge({}, radialIndicator.defaults, indOption);
this.indOption = indOption;
//create a queryselector if a selector string is passed in container
if (typeof container == "string")
container = document.querySelector(container);
//get the first element if container is a node list
if (container.length)
container = container[0];
this.container = container;
//create a canvas element
var canElm = document.createElement("canvas");
container.appendChild(canElm);
this.canElm = canElm; // dom object where drawing will happen
this.ctx = canElm.getContext('2d'); //get 2d canvas context
//add intial value
this.current_value = indOption.initValue || indOption.minValue || 0;
}
Indicator.prototype = {
constructor: radialIndicator,
init: function () {
var indOption = this.indOption,
canElm = this.canElm,
ctx = this.ctx,
dim = (indOption.radius + indOption.barWidth) * 2, //elm width and height
center = dim / 2; //center point in both x and y axis
//create a formatter function
this.formatter = typeof indOption.format == "function" "object") {
var range = Object.keys(curColor);
for (var i = 1, ln = range.length; i < ln; i++) {
var bottomVal = range[i - 1],
topVal = range[i],
bottomColor = curColor[bottomVal],
topColor = curColor[topVal],
newColor = val == bottomVal "round";
ctx.beginPath();
ctx.arc(center, center, indOption.radius, -(quart), ((circ) * perVal / 100) - quart, false);
ctx.stroke();
//add percentage text
if (indOption.displayNumber) {
var cFont = ctx.font.split(' '),
weight = indOption.fontWeight,
fontSize = indOption.fontSize || (dim / (this.maxLength - (Math.floor(this.maxLength*1.4/4)-1)));
cFont = indOption.fontFamily || cFont[cFont.length - 1];
ctx.fillStyle = indOption.fontColor || curColor;
ctx.font = weight +" "+ fontSize + "px " + cFont;
ctx.textAlign = "center";
ctx.textBaseline = 'middle';
ctx.fillText(dispVal, center, center);
}
return this;
},
//animate progressbar to the value
animate: function (val) {
var indOption = this.indOption,
counter = this.current_value || indOption.minValue,
self = this,
incBy = Math.ceil((indOption.maxValue - indOption.minValue) / (indOption.frameNum || (indOption.percentage "#ccc", 50 : '#333', 100: '#000'}
format: null, //format indicator numbers, can be a # formator ex (##,###.##) or a function
frameTime: 10, //miliseconds to move from one frame to another
frameNum: null, //Defines numbers of frame in indicator, defaults to 100 when showing percentage and 500 for other values
fontColor: null, //font color
fontFamily: null, //defines font family
fontWeight: 'bold', //defines font weight
fontSize : null, //define the font size of indicator number
interpolate: true, //interpolate color between ranges
percentage: false, //show percentage of value
displayNumber: true, //display indicator number
roundCorner: false, //have round corner in filled bar
minValue: 0, //minimum value
maxValue: 100, //maximum value
initValue: 0 //define initial value of indicator
};
window.radialIndicator = radialIndicator;
//add as a jquery plugin
if ($) {
$.fn.radialIndicator = function (options) {
return this.each(function () {
var newPCObj = radialIndicator(this, options);
$.data(this, 'radialIndicator', newPCObj);
});
};
}
}(window.jQuery, window, document, void 0));
以上所述是小编给大家介绍的JS实现环形进度条（从0到100%）效果 ，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！