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vue3实现数字滚动特效实例详解_vue.js_
2023-05-24
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简介 vue3实现数字滚动特效实例详解_vue.js_
前言
vue3不支持vue-count-to插件，无法使用vue-count-to实现数字动效，数字自动分割，vue-count-to主要针对vue2使用，vue3按照会报错： TypeError: Cannot read properties of undefined (reading '_c') 的错误信息。这个时候我们只能自己封装一个CountTo组件实现数字动效。先来看效果图:
思路
使用Vue.component定义公共组件，使用window.requestAnimationFrame（首选，次选setTimeout）来循环数字动画，window.cancelAnimationFrame取消数字动画效果，封装一个requestAnimationFrame.js公共文件，CountTo.vue组件，入口导出文件index.js。
文件目录
使用示例
入口文件index.js
const UILib = { install(Vue) { Vue.component('CountTo', CountTo) } } export default UILib main.js使用
import CountTo from './components/count-to/index'; app.use(CountTo)
requestAnimationFrame.js思路
- 先判断是不是浏览器还是其他环境
- 如果是浏览器判断浏览器内核类型
- 如果浏览器不支持requestAnimationFrame，cancelAnimationFrame方法，改写setTimeout定时器
- 导出两个方法 requestAnimationFrame, cancelAnimationFrame
各个浏览器前缀：let prefixes = 'webkit moz ms o';
判断是不是浏览器：let isServe = typeof window == 'undefined';
增加各个浏览器前缀：
let prefix; let requestAnimationFrame; let cancelAnimationFrame; // 通过遍历各浏览器前缀，来得到requestAnimationFrame和cancelAnimationFrame在当前浏览器的实现形式 for (let i = 0; i < prefixes.length; i++) { if (requestAnimationFrame && cancelAnimationFrame) { break } prefix = prefixes[i] requestAnimationFrame = requestAnimationFrame || window[prefix + 'RequestAnimationFrame'] cancelAnimationFrame = cancelAnimationFrame || window[prefix + 'CancelAnimationFrame'] || window[prefix + 'CancelRequestAnimationFrame'] } //不支持使用setTimeout方式替换：模拟60帧的效果 // 如果当前浏览器不支持requestAnimationFrame和cancelAnimationFrame，则会退到setTimeout if (!requestAnimationFrame || !cancelAnimationFrame) { requestAnimationFrame = function (callback) { const currTime = new Date().getTime() // 为了使setTimteout的尽可能的接近每秒60帧的效果 const timeToCall = Math.max(0, 16 - (currTime - lastTime)) const id = window.setTimeout(() => { callback(currTime + timeToCall) }, timeToCall) lastTime = currTime + timeToCall return id } cancelAnimationFrame = function (id) { window.clearTimeout(id) } } 完整代码：
requestAnimationFrame.js
let lastTime = 0 const prefixes = 'webkit moz ms o'.split(' ') // 各浏览器前缀 let requestAnimationFrame let cancelAnimationFrame // 判断是否是服务器环境 const isServer = typeof window === 'undefined' if (isServer) { requestAnimationFrame = function () { return } cancelAnimationFrame = function () { return } } else { requestAnimationFrame = window.requestAnimationFrame cancelAnimationFrame = window.cancelAnimationFrame let prefix // 通过遍历各浏览器前缀，来得到requestAnimationFrame和cancelAnimationFrame在当前浏览器的实现形式 for (let i = 0; i < prefixes.length; i++) { if (requestAnimationFrame && cancelAnimationFrame) { break } prefix = prefixes[i] requestAnimationFrame = requestAnimationFrame || window[prefix + 'RequestAnimationFrame'] cancelAnimationFrame = cancelAnimationFrame || window[prefix + 'CancelAnimationFrame'] || window[prefix + 'CancelRequestAnimationFrame'] } // 如果当前浏览器不支持requestAnimationFrame和cancelAnimationFrame，则会退到setTimeout if (!requestAnimationFrame || !cancelAnimationFrame) { requestAnimationFrame = function (callback) { const currTime = new Date().getTime() // 为了使setTimteout的尽可能的接近每秒60帧的效果 const timeToCall = Math.max(0, 16 - (currTime - lastTime)) const id = window.setTimeout(() => { callback(currTime + timeToCall) }, timeToCall) lastTime = currTime + timeToCall return id } cancelAnimationFrame = function (id) { window.clearTimeout(id) } } } export { requestAnimationFrame, cancelAnimationFrame } CountTo.vue组件思路
首先引入requestAnimationFrame.js,使用requestAnimationFrame方法接受count函数，还需要格式化数字，进行正则表达式转换，返回我们想要的数据格式。
引入 import { requestAnimationFrame, cancelAnimationFrame } from './requestAnimationFrame.js'
需要接受的参数：
const props = defineProps({ start: { type: Number, required: false, default: 0 }, end: { type: Number, required: false, default: 0 }, duration: { type: Number, required: false, default: 5000 }, autoPlay: { type: Boolean, required: false, default: true }, decimals: { type: Number, required: false, default: 0, validator (value) { return value >= 0 } }, decimal: { type: String, required: false, default: '.' }, separator: { type: String, required: false, default: ',' }, prefix: { type: String, required: false, default: '' }, suffix: { type: String, required: false, default: '' }, useEasing: { type: Boolean, required: false, default: true }, easingFn: { type: Function, default(t, b, c, d) { return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b; } } }) 启动数字动效
const startCount = () => { state.localStart = props.start state.startTime = null state.localDuration = props.duration state.paused = false state.rAF = requestAnimationFrame(count) } 核心函数，对数字进行转动
if (!state.startTime) state.startTime = timestamp state.timestamp = timestamp const progress = timestamp - state.startTime state.remaining = state.localDuration - progress // 是否使用速度变化曲线 if (props.useEasing) { if (stopCount.value) { state.printVal = state.localStart - props.easingFn(progress, 0, state.localStart - props.end, state.localDuration) } else { state.printVal = props.easingFn(progress, state.localStart, props.end - state.localStart, state.localDuration) } } else { if (stopCount.value) { state.printVal = state.localStart - ((state.localStart - props.end) * (progress / state.localDuration)) } else { state.printVal = state.localStart + (props.end - state.localStart) * (progress / state.localDuration) } } if (stopCount.value) { state.printVal = state.printVal < props.end ? props.end : state.printVal } else { state.printVal = state.printVal > props.end ? props.end : state.printVal } state.displayValue = formatNumber(state.printVal) if (progress < state.localDuration) { state.rAF = requestAnimationFrame(count) } else { emits('callback') } } // 格式化数据，返回想要展示的数据格式 const formatNumber = (val) => { val = val.toFixed(props.default) val += '' const x = val.split('.') let x1 = x[0] const x2 = x.length > 1 ? props.decimal + x[1] : '' const rgx = /(\d+)(\d{3})/ if (props.separator && !isNumber(props.separator)) { while (rgx.test(x1)) { x1 = x1.replace(rgx, '$1' + props.separator + '$2') } } return props.prefix + x1 + x2 + props.suffix } 取消动效
// 组件销毁时取消动画 onUnmounted(() => { cancelAnimationFrame(state.rAF) }) 完整代码
{{ state.displayValue }}