VUE----数字增加，兼容小程序

数字增加，兼容小程序

requestAnimationFrame 为浏览器提供的方法

export function countUp(duration, from, to, onProgress) {
	let value = from
	const speed = (to - from) / duration
	const start = Date.now()

	if (typeof window === 'undefined') {
		let requestAnimationFrame = (callback) => {
			setTimeout(() => {
				callback(Date.now());
			}, 1000 / 60); // 60为大多数显示器的刷新率
		}
	}

	function _run() {
		const t = Date.now() - start
		if (t >= duration) {
			value = to
			onProgress(value)
			return
		}

		value = from + t * speed
		onProgress(value)
		requestAnimationFrame(_run)
	}

	_run()
}

使用

countUp(2000, 0, 200, (val) => {
	console.log(val.toFixed(0))
})