CountUp.js实现数字滚动增值效果

// target = id of html element or var of previously selected html element where counting occurs
// startVal = the value you want to begin at
// endVal = the value you want to arrive at
// decimals = number of decimal places, default 0
// duration = duration of animation in seconds, default 2
// options = optional object of options (see below)
 
var CountUp = function (target, startVal, endVal, decimals, duration, options) {
 var self = this
 self.version = function () { return '1.9.3' }
 
 // default options
 self.options = {
 useEasing: true, // toggle easing
 useGrouping: true, // 1,000,000 vs 1000000
 separator: ',', // character to use as a separator
 decimal: '.', // character to use as a decimal
 easingFn: easeOutExpo, // optional custom easing function, default is Robert Penner's easeOutExpo
 formattingFn: formatNumber, // optional custom formatting function, default is formatNumber above
 prefix: '', // optional text before the result
 suffix: '', // optional text after the result
 numerals: [] // optionally pass an array of custom numerals for 0-9
 }
 
 // extend default options with passed options object
 if (options && typeof options === 'object') {
 for (var key in self.options) {
 if (options.hasOwnProperty(key) && options[key] !== null) {
 self.options[key] = options[key]
 }
 }
 }
 
 if (self.options.separator === '') {
 self.options.useGrouping = false
 } else {
 // ensure the separator is a string (formatNumber assumes this)
 self.options.separator = '' + self.options.separator
 }
 
 // make sure requestAnimationFrame and cancelAnimationFrame are defined
 // polyfill for browsers without native support
 // by Opera engineer Erik Möller
 var lastTime = 0
 var vendors = ['webkit', 'moz', 'ms', 'o']
 for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
 window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame']
 window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame']
 }
 if (!window.requestAnimationFrame) {
 window.requestAnimationFrame = function (callback, element) {
 var currTime = new Date().getTime()
 var timeToCall = Math.max(0, 16 - (currTime - lastTime))
 var tesult = currTime + timeToCall
 var id = window.setTimeout(function () { callback(tesult) }, timeToCall)
 lastTime = currTime + timeToCall
 return id
 }
 }
 if (!window.cancelAnimationFrame) {
 window.cancelAnimationFrame = function (id) {
 clearTimeout(id)
 }
 }
 
 function formatNumber (num) {
 var neg = (num < 0)
 var x, x1, x2, x3, i, len
 num = Math.abs(num).toFixed(self.decimals)
 num += ''
 x = num.split('.')
 x1 = x[0]
 x2 = x.length > 1 "htmlcode">

var options = {
 useEasing: true, // 使用缓和效果
 useGrouping: true, // 使用分组效果
 separator: ',', // 分离器，数据够三位，例如100,000
 decimal: '.', // 小数点分割，例如：10.00
 prefix: '', // 第一位默认数字，例如：¥
 suffix: '' // 最后一位默认数字，例如：元，美元
 }
 // new CountUp(target, startVal, endVal, decimals, duration, options)
 // target = 目标元素的 ID
 // startVal = 开始值
 // endVal = 结束值
 // decimals = 小数位数 默认值是0
 // duration = 动画延迟秒数，默认值是2；
 // options = optional object of options (see below)
 
 var demo = new CountUp('extractionMoney', 0, data.balanceAmount, 2, 0.5, options)
 if (!demo.error) {
 demo.start()
 } else {
 console.error(demo.error)
 }


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