這篇文章將為大家詳細(xì)講解有關(guān)使用countUp.js怎么實(shí)現(xiàn)一個(gè)數(shù)字滾動(dòng)效果,文章內(nèi)容質(zhì)量較高,因此小編分享給大家做個(gè)參考,希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。
創(chuàng)新互聯(lián)網(wǎng)站建設(shè)服務(wù)商,為中小企業(yè)提供做網(wǎng)站、成都網(wǎng)站建設(shè)服務(wù),網(wǎng)站設(shè)計(jì),成都網(wǎng)站托管等一站式綜合服務(wù)型公司,專(zhuān)業(yè)打造企業(yè)形象網(wǎng)站,讓您在眾多競(jìng)爭(zhēng)對(duì)手中脫穎而出創(chuàng)新互聯(lián)。1.1 說(shuō)明
在項(xiàng)目過(guò)程中,有時(shí)候需要?jiǎng)討B(tài)的去展示一些數(shù)據(jù)的加載狀態(tài),如一個(gè)數(shù)字為10000,需要5秒時(shí)間滾動(dòng)加載完成。此時(shí)使用countup.js就能夠很方便的處理此類(lèi)功能問(wèn)題。
1.2 countup.js
countup.js是一個(gè)無(wú)依賴(lài)性、輕量級(jí)的javascript類(lèi),可用于快速創(chuàng)建動(dòng)畫(huà),以更有趣的方式顯示數(shù)字/數(shù)據(jù)。詳見(jiàn)countup.js
1.3 countup.js使用
npm install countup 進(jìn)行安裝依賴(lài)
import CountUp from "countup" 在頁(yè)面中引入
new CountUp(target, startVal, endVal, decimals, duration, options)
參數(shù):
target: 目標(biāo)元素的id *必填
startVal:開(kāi)始的值(從哪個(gè)值開(kāi)始) *必填
endVal:結(jié)束的值(滾動(dòng)到哪個(gè)值結(jié)束) *必填
decimals:小數(shù)位數(shù),默認(rèn)值為0 *可選
duration:動(dòng)畫(huà)持續(xù)時(shí)間,單位為秒,默認(rèn)值為2 *可選
options:選項(xiàng)的可選對(duì)象 *可選
useEasing:true --是否使用緩動(dòng)動(dòng)畫(huà),默認(rèn)為緩動(dòng),可設(shè)置為false讓其勻速
useGrouping:true --對(duì)數(shù)字進(jìn)行分組,如12345,按三位一組變?yōu)轭?lèi)似12,345這樣的
separator: ',' --分組時(shí)使用的分隔符默認(rèn)是逗號(hào)
decimal: '.' --小數(shù)點(diǎn)
prefix: '' --添加前綴如12345,變?yōu)椋?2345
suffix: '' --添加后綴如12345 通過(guò)添加后綴變?yōu)?2345$,12345元之類(lèi)的
方法:
暫停/恢復(fù) pauseResume
重置動(dòng)畫(huà) reset
更新值 update(newVal)
2. 代碼
2.1 源代碼
var CountUp = function(target, startVal, endVal, decimals, duration, options) { var self = this; self.version = function() { return "1.9.2" }; self.options = { useEasing: true, useGrouping: true, separator: ",", decimal: ".", easingFn: easeOutExpo, formattingFn: formatNumber, prefix: "", suffix: "", numerals: [] }; 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 { self.options.separator = "" + self.options.separator } 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 id = window.setTimeout(function() { callback(currTime + timeToCall) }, timeToCall); lastTime = currTime + timeToCall; return id } } if (!window.cancelAnimationFrame) { window.cancelAnimationFrame = function(id) { clearTimeout(id) } } function formatNumber(num) { num = num.toFixed(self.decimals); num += ""; var x, x1, x2, x3, i, l; x = num.split("."); x1 = x[0]; x2 = x.length > 1 ? self.options.decimal + x[1] : ""; if (self.options.useGrouping) { x3 = ""; for (i = 0, l = x1.length; i < l; ++i) { if (i !== 0 && ((i % 3) === 0)) { x3 = self.options.separator + x3 } x3 = x1[l - i - 1] + x3 } x1 = x3 } if (self.options.numerals.length) { x1 = x1.replace(/[0-9]/g, function(w) { return self.options.numerals[ + w] }); x2 = x2.replace(/[0-9]/g, function(w) { return self.options.numerals[ + w] }) } return self.options.prefix + x1 + x2 + self.options.suffix } function easeOutExpo(t, b, c, d) { return c * ( - Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b } function ensureNumber(n) { return (typeof n === "number" && !isNaN(n)) } self.initialize = function() { if (self.initialized) { return true } self.error = ""; self.d = (typeof target === "string") ? document.getElementById(target) : target; if (!self.d) { self.error = "[CountUp] target is null or undefined"; return false } self.startVal = Number(startVal); self.endVal = Number(endVal); if (ensureNumber(self.startVal) && ensureNumber(self.endVal)) { self.decimals = Math.max(0, decimals || 0); self.dec = Math.pow(10, self.decimals); self.duration = Number(duration) * 1000 || 2000; self.countDown = (self.startVal > self.endVal); self.frameVal = self.startVal; self.initialized = true; return true } else { self.error = "[CountUp] startVal (" + startVal + ") or endVal (" + endVal + ") is not a number"; return false } }; self.printValue = function(value) { var result = self.options.formattingFn(value); if (self.d.tagName === "INPUT") { this.d.value = result } else { if (self.d.tagName === "text" || self.d.tagName === "tspan") { this.d.textContent = result } else { this.d.innerHTML = result } } }; self.count = function(timestamp) { if (!self.startTime) { self.startTime = timestamp } self.timestamp = timestamp; var progress = timestamp - self.startTime; self.remaining = self.duration - progress; if (self.options.useEasing) { if (self.countDown) { self.frameVal = self.startVal - self.options.easingFn(progress, 0, self.startVal - self.endVal, self.duration) } else { self.frameVal = self.options.easingFn(progress, self.startVal, self.endVal - self.startVal, self.duration) } } else { if (self.countDown) { self.frameVal = self.startVal - ((self.startVal - self.endVal) * (progress / self.duration)) } else { self.frameVal = self.startVal + (self.endVal - self.startVal) * (progress / self.duration) } } if (self.countDown) { self.frameVal = (self.frameVal < self.endVal) ? self.endVal: self.frameVal } else { self.frameVal = (self.frameVal > self.endVal) ? self.endVal: self.frameVal } self.frameVal = Math.round(self.frameVal * self.dec) / self.dec; self.printValue(self.frameVal); if (progress < self.duration) { self.rAF = requestAnimationFrame(self.count) } else { if (self.callback) { self.callback() } } }; self.start = function(callback) { if (!self.initialize()) { return } self.callback = callback; self.rAF = requestAnimationFrame(self.count) }; self.pauseResume = function() { if (!self.paused) { self.paused = true; cancelAnimationFrame(self.rAF) } else { self.paused = false; delete self.startTime; self.duration = self.remaining; self.startVal = self.frameVal; requestAnimationFrame(self.count) } }; self.reset = function() { self.paused = false; delete self.startTime; self.initialized = false; if (self.initialize()) { cancelAnimationFrame(self.rAF); self.printValue(self.startVal) } }; self.update = function(newEndVal) { if (!self.initialize()) { return } newEndVal = Number(newEndVal); if (!ensureNumber(newEndVal)) { self.error = "[CountUp] update() - new endVal is not a number: " + newEndVal; return } self.error = ""; if (newEndVal === self.frameVal) { return } cancelAnimationFrame(self.rAF); self.paused = false; delete self.startTime; self.startVal = self.frameVal; self.endVal = newEndVal; self.countDown = (self.startVal > self.endVal); self.rAF = requestAnimationFrame(self.count) }; if (self.initialize()) { self.printValue(self.startVal) } };
2.1 代碼示例
<!-- 數(shù)字滾動(dòng) --> <template> <div id="numScroll" ></div> </template> <script> import CountUp from "countup" export default { name: "numberScroll.vue", mounted() { this.numberScroll() }, methods: { numberScroll() { let count = new CountUp("numScroll", 0, 56565, 0, 5, {duration: 5, useEasing: false}) if (!count.error) { count.start() } else { console.log(count.error) } } } } </script>
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