u-count-to.vue
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<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>