uni-app引入使用uView

yudao-ui-app/uni_modules/uview-ui/components/u-count-to/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>