jquery数字滚动到指定数字效果

这是一个使用JavaScript库countup.js实现数字从startVal滚动到endVal的效果。该库支持自定义小数位数、动画时长、分隔符、小数点等选项,并提供了缓动函数和格式化数字的方法。它还包含了处理动画帧的逻辑,确保数字平滑地滚动到目标值。当动画完成或需要更新目标值时,可以调用相应的函数进行控制。

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	<script type="text/javascript" src="./jQuery数字动画特效_files/jquery-1.7.2.min.js"></script>
	<script type="text/javascript" src="./jQuery数字动画特效_files/countUp.min.js"></script>
	<h1 id="num1"></h1>
	<h1 id="num2"></h1>
	<h1 id="num3"></h1>

	<script type="text/javascript">
		var options = {  
			  useEasing: true, 	 	// 使用缓和
			  useGrouping: true,	// 使用分组(是否显示千位分隔符,一般为 true)
			  separator: ',',		// 分隔器(千位分隔符,默认为',')
			  decimal: '.',			// 十进制(小数点符号,默认为 '.')
			  prefix: '',			// 字首(数字的前缀,根据需要可设为 $,¥,¥ 等)
			  suffix: ''			// 后缀(数字的后缀 ,根据需要可设为 元,个,美元 等) 
		};
		$(function() {
			// CountUp(参数一, 参数二, 参数三, 参数四, 参数五, 参数六)
			// 参数一: 数字所在容器
			// 参数二: 数字开始增长前的默认值(起始值),一般从 0 开始增长
			// 参数三: 数字增长后的最终值,该值一般通过异步请求获取
			// 参数四: 数字小数点后保留的位数
			// 参数五: 数字增长特效的时间,此处为3秒
			// 参数六: 其他配置项
			// 注: 参数六也可不加,其配置项则为默认值
			
			new CountUp("num1", 0, 1380, 0, 3, options).start();
			new CountUp("num2", 0, 1380, 2, 3, options).start();
			new CountUp("num3", 0, 1380, 4, 3, options).start();
		});
	</script>

</body>

countup.js源码
var CountUp = function (target, startVal, endVal, decimals, duration, options) {
var self = this;
self.version = function () {
return “1.9.2”
};
self.options = {
useEasing: true,
useGrouping: true,
separator: “,”,
decimal: “.”,
easingFn: easeOutExpo,
formattingFn: formatNumber,
prefix: “”,
suffix: “”,
numerals: []
};
if (options && typeof options === “object”) {
for (var key in self.options) {
if (options.hasOwnProperty(key) && options[key] !== null) {
self.options[key] = options[key]
}
}
}
if (self.options.separator === “”) {
self.options.useGrouping = false
} else {
self.options.separator = “” + self.options.separator
}
var lastTime = 0;
var vendors = [“webkit”, “moz”, “ms”, “o”];
for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x] + “RequestAnimationFrame”];
window.cancelAnimationFrame = window[vendors[x] + “CancelAnimationFrame”] || window[vendors[x] + “CancelRequestAnimationFrame”]
}
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = function (callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function () {
callback(currTime + timeToCall)
}, timeToCall);
lastTime = currTime + timeToCall;
return id
}
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = function (id) {
clearTimeout(id)
}
}

function formatNumber(num) {
num = num.toFixed(self.decimals);
num += “”;
var x, x1, x2, x3, i, l;
x = num.split(".");
x1 = x[0];
x2 = x.length > 1 ? self.options.decimal + x[1] : “”;
if (self.options.useGrouping) {
x3 = “”;
for (i = 0, l = x1.length; i < l; ++i) {
if (i !== 0 && ((i % 3) === 0)) {
x3 = self.options.separator + x3
}
x3 = x1[l - i - 1] + x3
}
x1 = x3
}
if (self.options.numerals.length) {
x1 = x1.replace(/[0-9]/g, function (w) {
return self.options.numerals[+w]
});
x2 = x2.replace(/[0-9]/g, function (w) {
return self.options.numerals[+w]
})
}
return self.options.prefix + x1 + x2 + self.options.suffix
}

function easeOutExpo(t, b, c, d) {
return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b
}

function ensureNumber(n) {
return (typeof n === “number” && !isNaN(n))
}
self.initialize = function () {
if (self.initialized) {
return true
}
self.error = “”;
self.d = (typeof target === “string”) ? document.getElementById(target) : target;
if (!self.d) {
self.error = “[CountUp] target is null or undefined”;
return false
}
self.startVal = Number(startVal);
self.endVal = Number(endVal);
if (ensureNumber(self.startVal) && ensureNumber(self.endVal)) {
self.decimals = Math.max(0, decimals || 0);
self.dec = Math.pow(10, self.decimals);
self.duration = Number(duration) * 1000 || 2000;
self.countDown = (self.startVal > self.endVal);
self.frameVal = self.startVal;
self.initialized = true;
return true
} else {
self.error = “[CountUp] startVal (” + startVal + “) or endVal (” + endVal + “) is not a number”;
return false
}
};
self.printValue = function (value) {
var result = self.options.formattingFn(value);
if (self.d.tagName === “INPUT”) {
this.d.value = result
} else {
if (self.d.tagName === “text” || self.d.tagName === “tspan”) {
this.d.textContent = result
} else {
this.d.innerHTML = result
}
}
};
self.count = function (timestamp) {
if (!self.startTime) {
self.startTime = timestamp
}
self.timestamp = timestamp;
var progress = timestamp - self.startTime;
self.remaining = self.duration - progress;
if (self.options.useEasing) {
if (self.countDown) {
self.frameVal = self.startVal - self.options.easingFn(progress, 0, self.startVal - self.endVal, self.duration)
} else {
self.frameVal = self.options.easingFn(progress, self.startVal, self.endVal - self.startVal, self.duration)
}
} else {
if (self.countDown) {
self.frameVal = self.startVal - ((self.startVal - self.endVal) * (progress / self.duration))
} else {
self.frameVal = self.startVal + (self.endVal - self.startVal) * (progress / self.duration)
}
}
if (self.countDown) {
self.frameVal = (self.frameVal < self.endVal) ? self.endVal : self.frameVal
} else {
self.frameVal = (self.frameVal > self.endVal) ? self.endVal : self.frameVal
}
self.frameVal = Math.round(self.frameVal * self.dec) / self.dec;
self.printValue(self.frameVal);
if (progress < self.duration) {
self.rAF = requestAnimationFrame(self.count)
} else {
if (self.callback) {
self.callback()
}
}
};
self.start = function (callback) {
if (!self.initialize()) {
return
}
self.callback = callback;
self.rAF = requestAnimationFrame(self.count)
};
self.pauseResume = function () {
if (!self.paused) {
self.paused = true;
cancelAnimationFrame(self.rAF)
} else {
self.paused = false;
delete self.startTime;
self.duration = self.remaining;
self.startVal = self.frameVal;
requestAnimationFrame(self.count)
}
};
self.reset = function () {
self.paused = false;
delete self.startTime;
self.initialized = false;
if (self.initialize()) {
cancelAnimationFrame(self.rAF);
self.printValue(self.startVal)
}
};
self.update = function (newEndVal) {
if (!self.initialize()) {
return
}
newEndVal = Number(newEndVal);
if (!ensureNumber(newEndVal)) {
self.error = "[CountUp] update() - new endVal is not a number: " + newEndVal;
return
}
self.error = “”;
if (newEndVal === self.frameVal) {
return
}
cancelAnimationFrame(self.rAF);
self.paused = false;
delete self.startTime;
self.startVal = self.frameVal;
self.endVal = newEndVal;
self.countDown = (self.startVal > self.endVal);
self.rAF = requestAnimationFrame(self.count)
};
if (self.initialize()) {
self.printValue(self.startVal)
}
};

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