这里是计算数字的代码... 我想要一个简单的东西，但是我是JavaScript的新手，所以我需要您的帮助...
我只需要“ console.log（“正在计数的数字”）...“ 使用纯JavaScript。我不需要HTML或CSS，只需要javascript ... < / p>
注意：我使用“表达故事情节”中的按钮执行代码...不重要的是，告诉我如何记录计数数字即可。
我尽了最大努力，但我真的需要您的帮助...
以下是使用此代码的指南：
https://redstapler.co/countup-js-tutorial-counting-animation/
这是代码：
/*
countUp.js
by @inorganik
*/
// target = id of html element or var of previously selected html element where counting occurs
// startVal = the value you want to begin at
// endVal = the value you want to arrive at
// decimals = number of decimal places, default 0
// duration = duration of animation in seconds, default 2
// options = optional object of options (see below)
var CountUp = function(target, startVal, endVal, decimals, duration, options) {
var self = this;
self.version = function () { return '1.9.3'; };
// default options
self.options = {
useEasing: true, // toggle easing
useGrouping: true, // 1,000,000 vs 1000000
separator: ',', // character to use as a separator
decimal: '.', // character to use as a decimal
easingFn: easeOutExpo, // optional custom easing function, default is Robert Penner's easeOutExpo
formattingFn: formatNumber, // optional custom formatting function, default is formatNumber above
prefix: '', // optional text before the result
suffix: '', // optional text after the result
numerals: [] // optionally pass an array of custom numerals for 0-9
};
// extend default options with passed options object
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 {
// ensure the separator is a string (formatNumber assumes this)
self.options.separator = '' + self.options.separator;
}
// make sure requestAnimationFrame and cancelAnimationFrame are defined
// polyfill for browsers without native support
// by Opera engineer Erik Möller
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) {
var neg = (num < 0),
x, x1, x2, x3, i, len;
num = Math.abs(num).toFixed(self.decimals);
num += '';
x = num.split('.');
x1 = x[0];
x2 = x.length > 1 ? self.options.decimal + x[1] : '';
if (self.options.useGrouping) {
x3 = '';
for (i = 0, len = x1.length; i < len; ++i) {
if (i !== 0 && ((i % 3) === 0)) {
x3 = self.options.separator + x3;
}
x3 = x1[len - i - 1] + x3;
}
x1 = x3;
}
// optional numeral substitution
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 (neg ? '-' : '') + self.options.prefix + x1 + x2 + self.options.suffix;
}
// Robert Penner's easeOutExpo
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);
// error checks
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;
}
};
// Print value to target
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;
// to ease or not to ease
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);
}
}
// don't go past endVal since progress can exceed duration in the last frame
if (self.countDown) {
self.frameVal = (self.frameVal < self.endVal) ? self.endVal : self.frameVal;
} else {
self.frameVal = (self.frameVal > self.endVal) ? self.endVal : self.frameVal;
}
// decimal
self.frameVal = Math.round(self.frameVal*self.dec)/self.dec;
// format and print value
self.printValue(self.frameVal);
// whether to continue
if (progress < self.duration) {
self.rAF = requestAnimationFrame(self.count);
} else {
if (self.callback) self.callback();
}
};
// start your animation
self.start = function(callback) {
if (!self.initialize()) return;
self.callback = callback;
self.rAF = requestAnimationFrame(self.count);
};
// toggles pause/resume animation
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);
}
};
// reset to startVal so animation can be run again
self.reset = function() {
self.paused = false;
delete self.startTime;
self.initialized = false;
if (self.initialize()) {
cancelAnimationFrame(self.rAF);
self.printValue(self.startVal);
}
};
// pass a new endVal and start animation
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);
};
// format startVal on initialization
if (self.initialize()) self.printValue(self.startVal);
};
答案 0 :(得分：0)
在模块中，他具有printValue功能。您可以在屏幕上注销正在打印的号码。由于动画和缓动，您可以看到它经常打印相同的数字。
// Print value to target
self.printValue = function(value) {
var result = self.options.formattingFn(value);
console.log(value); // add line to log out 'value'
function go() {
var demo = new CountUp('count', 0, 20);
if (!demo.error) {
demo.start();
} else {
console.error(demo.error);
}
}
/*
countUp.js
by @inorganik
*/
// target = id of html element or var of previously selected html element where counting occurs
// startVal = the value you want to begin at
// endVal = the value you want to arrive at
// decimals = number of decimal places, default 0
// duration = duration of animation in seconds, default 2
// options = optional object of options (see below)
function CountUp(target, startVal, endVal, decimals, duration, options) {
var self = this;
self.version = function() {
return '1.9.3';
};
// default options
self.options = {
useEasing: true, // toggle easing
useGrouping: true, // 1,000,000 vs 1000000
separator: ',', // character to use as a separator
decimal: '.', // character to use as a decimal
easingFn: easeOutExpo, // optional custom easing function, default is Robert Penner's easeOutExpo
formattingFn: formatNumber, // optional custom formatting function, default is formatNumber above
prefix: '', // optional text before the result
suffix: '', // optional text after the result
numerals: [] // optionally pass an array of custom numerals for 0-9
};
// extend default options with passed options object
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 {
// ensure the separator is a string (formatNumber assumes this)
self.options.separator = '' + self.options.separator;
}
// make sure requestAnimationFrame and cancelAnimationFrame are defined
// polyfill for browsers without native support
// by Opera engineer Erik Möller
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) {
var neg = (num < 0),
x, x1, x2, x3, i, len;
num = Math.abs(num).toFixed(self.decimals);
num += '';
x = num.split('.');
x1 = x[0];
x2 = x.length > 1 ? self.options.decimal + x[1] : '';
if (self.options.useGrouping) {
x3 = '';
for (i = 0, len = x1.length; i < len; ++i) {
if (i !== 0 && ((i % 3) === 0)) {
x3 = self.options.separator + x3;
}
x3 = x1[len - i - 1] + x3;
}
x1 = x3;
}
// optional numeral substitution
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 (neg ? '-' : '') + self.options.prefix + x1 + x2 + self.options.suffix;
}
// Robert Penner's easeOutExpo
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);
// error checks
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;
}
};
// Print value to target
self.printValue = function(value) {
var result = self.options.formattingFn(value);
console.log(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;
// to ease or not to ease
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);
}
}
// don't go past endVal since progress can exceed duration in the last frame
if (self.countDown) {
self.frameVal = (self.frameVal < self.endVal) ? self.endVal : self.frameVal;
} else {
self.frameVal = (self.frameVal > self.endVal) ? self.endVal : self.frameVal;
}
// decimal
self.frameVal = Math.round(self.frameVal * self.dec) / self.dec;
// format and print value
self.printValue(self.frameVal);
// whether to continue
if (progress < self.duration) {
self.rAF = requestAnimationFrame(self.count);
} else {
if (self.callback) self.callback();
}
};
// start your animation
self.start = function(callback) {
if (!self.initialize()) return;
self.callback = callback;
self.rAF = requestAnimationFrame(self.count);
};
// toggles pause/resume animation
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);
}
};
// reset to startVal so animation can be run again
self.reset = function() {
self.paused = false;
delete self.startTime;
self.initialized = false;
if (self.initialize()) {
cancelAnimationFrame(self.rAF);
self.printValue(self.startVal);
}
};
// pass a new endVal and start animation
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);
};
// format startVal on initialization
if (self.initialize()) self.printValue(self.startVal);
}<button onclick="go()">Go</button>
<div id="count"></div>