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8.0 KiB
Vue

<template>
<view
class="u-count-num"
:style="{
fontSize: fontSize + 'rpx',
fontWeight: bold ? 'bold' : 'normal',
color: color
}"
>
{{ displayValue }}
</view>
</template>
<script>
/**
* 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} start-val 开始值
* @property {String Number} end-val 结束值
* @property {String Number} duration 滚动过程所需的时间单位ms默认2000
* @property {Boolean} autoplay 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} use-easing 滚动结束时是否缓动结尾见官网说明默认true
* @property {String} separator 千位分隔符见官网说明
* @property {String} color 字体颜色默认#303133
* @property {String Number} font-size 字体大小单位rpx默认50
* @property {Boolean} bold 字体是否加粗默认false
* @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',
props: {
// 开始的数值默认从0增长到某一个数
startVal: {
type: [Number, String],
default: 0
},
// 要滚动的目标数值,必须
endVal: {
type: [Number, String],
default: 0,
required: true
},
// 滚动到目标数值的动画持续时间单位为毫秒ms
duration: {
type: [Number, String],
default: 2000
},
// 设置数值后是否自动开始滚动
autoplay: {
type: Boolean,
default: true
},
// 要显示的小数位数
decimals: {
type: [Number, String],
default: 0
},
// 是否在即将到达目标数值的时候,使用缓慢滚动的效果
useEasing: {
type: Boolean,
default: true
},
// 十进制分割
decimal: {
type: [Number, String],
default: '.'
},
// 字体颜色
color: {
type: String,
default: '#303133'
},
// 字体大小
fontSize: {
type: [Number, String],
default: 50
},
// 是否加粗字体
bold: {
type: Boolean,
default: false
},
// 千位分隔符,类似金额的分割(¥23,321.05中的",")
separator: {
type: String,
default: ''
}
},
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
};
},
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() {
this.startTime = null;
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);
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/style.components.scss";
.u-count-num {
/* #ifndef APP-NVUE */
display: inline-flex;
/* #endif */
text-align: center;
}
</style>