New file |
| | |
| | | <template> |
| | | <text |
| | | class="u-count-num" |
| | | :style="{ |
| | | fontSize: $u.addUnit(fontSize), |
| | | fontWeight: bold ? 'bold' : 'normal', |
| | | color: color |
| | | }" |
| | | >{{ displayValue }}</text> |
| | | </template> |
| | | |
| | | <script> |
| | | import props from './props.js'; |
| | | /** |
| | | * countTo 数字滚动 |
| | | * @description 该组件一般用于需要滚动数字到某一个值的场景,目标要求是一个递增的值。 |
| | | * @tutorial https://www.uviewui.com/components/countTo.html |
| | | * @property {String | Number} startVal 开始的数值,默认从0增长到某一个数(默认 0 ) |
| | | * @property {String | Number} endVal 要滚动的目标数值,必须 (默认 0 ) |
| | | * @property {String | Number} duration 滚动到目标数值的动画持续时间,单位为毫秒(ms) (默认 2000 ) |
| | | * @property {Boolean} autoplay 设置数值后是否自动开始滚动 (默认 true ) |
| | | * @property {String | Number} decimals 要显示的小数位数,见官网说明(默认 0 ) |
| | | * @property {Boolean} useEasing 滚动结束时,是否缓动结尾,见官网说明(默认 true ) |
| | | * @property {String} decimal 十进制分割 ( 默认 "." ) |
| | | * @property {String} color 字体颜色( 默认 '#606266' ) |
| | | * @property {String | Number} fontSize 字体大小,单位px( 默认 22 ) |
| | | * @property {Boolean} bold 字体是否加粗(默认 false ) |
| | | * @property {String} separator 千位分隔符,见官网说明 |
| | | * @event {Function} end 数值滚动到目标值时触发 |
| | | * @example <u-count-to ref="uCountTo" :end-val="endVal" :autoplay="autoplay"></u-count-to> |
| | | */ |
| | | export default { |
| | | name: 'u-count-to', |
| | | data() { |
| | | return { |
| | | localStartVal: this.startVal, |
| | | displayValue: this.formatNumber(this.startVal), |
| | | printVal: null, |
| | | paused: false, // 是否暂停 |
| | | localDuration: Number(this.duration), |
| | | startTime: null, // 开始的时间 |
| | | timestamp: null, // 时间戳 |
| | | remaining: null, // 停留的时间 |
| | | rAF: null, |
| | | lastTime: 0 // 上一次的时间 |
| | | }; |
| | | }, |
| | | mixins: [uni.$u.mpMixin, uni.$u.mixin,props], |
| | | computed: { |
| | | countDown() { |
| | | return this.startVal > this.endVal; |
| | | } |
| | | }, |
| | | watch: { |
| | | startVal() { |
| | | this.autoplay && this.start(); |
| | | }, |
| | | endVal() { |
| | | this.autoplay && this.start(); |
| | | } |
| | | }, |
| | | mounted() { |
| | | this.autoplay && this.start(); |
| | | }, |
| | | methods: { |
| | | easingFn(t, b, c, d) { |
| | | return (c * (-Math.pow(2, (-10 * t) / d) + 1) * 1024) / 1023 + b; |
| | | }, |
| | | requestAnimationFrame(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 - this.lastTime)); |
| | | const id = setTimeout(() => { |
| | | callback(currTime + timeToCall); |
| | | }, timeToCall); |
| | | this.lastTime = currTime + timeToCall; |
| | | return id; |
| | | }, |
| | | cancelAnimationFrame(id) { |
| | | clearTimeout(id); |
| | | }, |
| | | // 开始滚动数字 |
| | | start() { |
| | | this.localStartVal = this.startVal; |
| | | this.startTime = null; |
| | | this.localDuration = this.duration; |
| | | this.paused = false; |
| | | this.rAF = this.requestAnimationFrame(this.count); |
| | | }, |
| | | // 暂定状态,重新再开始滚动;或者滚动状态下,暂停 |
| | | reStart() { |
| | | if (this.paused) { |
| | | this.resume(); |
| | | this.paused = false; |
| | | } else { |
| | | this.stop(); |
| | | this.paused = true; |
| | | } |
| | | }, |
| | | // 暂停 |
| | | stop() { |
| | | this.cancelAnimationFrame(this.rAF); |
| | | }, |
| | | // 重新开始(暂停的情况下) |
| | | resume() { |
| | | if (!this.remaining) return |
| | | this.startTime = 0; |
| | | this.localDuration = this.remaining; |
| | | this.localStartVal = this.printVal; |
| | | this.requestAnimationFrame(this.count); |
| | | }, |
| | | // 重置 |
| | | reset() { |
| | | this.startTime = null; |
| | | this.cancelAnimationFrame(this.rAF); |
| | | this.displayValue = this.formatNumber(this.startVal); |
| | | }, |
| | | count(timestamp) { |
| | | if (!this.startTime) this.startTime = timestamp; |
| | | this.timestamp = timestamp; |
| | | const progress = timestamp - this.startTime; |
| | | this.remaining = this.localDuration - progress; |
| | | if (this.useEasing) { |
| | | if (this.countDown) { |
| | | this.printVal = this.localStartVal - this.easingFn(progress, 0, this.localStartVal - this.endVal, this.localDuration); |
| | | } else { |
| | | this.printVal = this.easingFn(progress, this.localStartVal, this.endVal - this.localStartVal, this.localDuration); |
| | | } |
| | | } else { |
| | | if (this.countDown) { |
| | | this.printVal = this.localStartVal - (this.localStartVal - this.endVal) * (progress / this.localDuration); |
| | | } else { |
| | | this.printVal = this.localStartVal + (this.endVal - this.localStartVal) * (progress / this.localDuration); |
| | | } |
| | | } |
| | | if (this.countDown) { |
| | | this.printVal = this.printVal < this.endVal ? this.endVal : this.printVal; |
| | | } else { |
| | | this.printVal = this.printVal > this.endVal ? this.endVal : this.printVal; |
| | | } |
| | | this.displayValue = this.formatNumber(this.printVal) || 0; |
| | | if (progress < this.localDuration) { |
| | | this.rAF = this.requestAnimationFrame(this.count); |
| | | } else { |
| | | this.$emit('end'); |
| | | } |
| | | }, |
| | | // 判断是否数字 |
| | | isNumber(val) { |
| | | return !isNaN(parseFloat(val)); |
| | | }, |
| | | formatNumber(num) { |
| | | // 将num转为Number类型,因为其值可能为字符串数值,调用toFixed会报错 |
| | | num = Number(num); |
| | | num = num.toFixed(Number(this.decimals)); |
| | | num += ''; |
| | | const x = num.split('.'); |
| | | let x1 = x[0]; |
| | | const x2 = x.length > 1 ? this.decimal + x[1] : ''; |
| | | const rgx = /(\d+)(\d{3})/; |
| | | if (this.separator && !this.isNumber(this.separator)) { |
| | | while (rgx.test(x1)) { |
| | | x1 = x1.replace(rgx, '$1' + this.separator + '$2'); |
| | | } |
| | | } |
| | | return x1 + x2; |
| | | }, |
| | | destroyed() { |
| | | this.cancelAnimationFrame(this.rAF); |
| | | } |
| | | } |
| | | }; |
| | | </script> |
| | | |
| | | <style lang="scss" scoped> |
| | | @import "../../libs/css/components.scss"; |
| | | |
| | | .u-count-num { |
| | | /* #ifndef APP-NVUE */ |
| | | display: inline-flex; |
| | | /* #endif */ |
| | | text-align: center; |
| | | } |
| | | </style> |