index.vue
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<template>
<span>{{ displayValue }}</span>
</template>
<script>
import {
requestAnimationFrame,
cancelAnimationFrame,
} from './requestAnimationFrame.js'
export default {
name: 'HtCount',
props: {
startVal: {
type: Number,
required: false,
default: 0,
},
endVal: {
type: Number,
required: false,
default: 0,
},
duration: {
type: Number,
required: false,
default: 3000,
},
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
},
},
},
data() {
return {
localStartVal: this.startVal,
displayValue: this.formatNumber(this.startVal),
printVal: null,
paused: false,
localDuration: this.duration,
startTime: null,
timestamp: null,
remaining: null,
rAF: null,
}
},
computed: {
countDown() {
return this.startVal > this.endVal
},
},
watch: {
startVal() {
if (this.autoplay) {
this.start()
}
},
endVal() {
if (this.autoplay) {
this.start()
}
},
},
mounted() {
if (this.autoplay) {
this.start()
}
this.$emit('mountedCallback')
},
destroyed() {
cancelAnimationFrame(this.rAF)
},
methods: {
start() {
this.localStartVal = this.startVal
this.startTime = null
this.localDuration = this.duration
this.paused = false
this.rAF = requestAnimationFrame(this.count)
},
pauseResume() {
if (this.paused) {
this.resume()
this.paused = false
} else {
this.pause()
this.paused = true
}
},
pause() {
cancelAnimationFrame(this.rAF)
},
resume() {
this.startTime = null
this.localDuration = +this.remaining
this.localStartVal = +this.printVal
requestAnimationFrame(this.count)
},
reset() {
this.startTime = null
cancelAnimationFrame(this.rAF)
this.displayValue = this.formatNumber(this.startVal)
},
count(timestamp) {
if (!this.startTime) this.startTime = timestamp
this.timestamp = timestamp
const progress = timestamp - this.startTime
this.remaining = this.localDuration - progress
if (this.useEasing) {
if (this.countDown) {
this.printVal =
this.localStartVal -
this.easingFn(
progress,
0,
this.localStartVal - this.endVal,
this.localDuration
)
} else {
this.printVal = this.easingFn(
progress,
this.localStartVal,
this.endVal - this.localStartVal,
this.localDuration
)
}
} else {
if (this.countDown) {
this.printVal =
this.localStartVal -
(this.localStartVal - this.endVal) *
(progress / this.localDuration)
} else {
this.printVal =
this.localStartVal +
(this.endVal - this.localStartVal) *
(progress / this.localDuration)
}
}
if (this.countDown) {
this.printVal =
this.printVal < this.endVal ? this.endVal : this.printVal
} else {
this.printVal =
this.printVal > this.endVal ? this.endVal : this.printVal
}
this.displayValue = this.formatNumber(this.printVal)
if (progress < this.localDuration) {
this.rAF = requestAnimationFrame(this.count)
} else {
this.$emit('callback')
}
},
isNumber(val) {
return !isNaN(parseFloat(val))
},
formatNumber(num) {
num = num.toFixed(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 this.prefix + x1 + x2 + this.suffix
},
},
}
</script>