countUp.js-让数字动起来
先上一段示例代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> .money{font-size: 30px;text-align: center;}
.money1{color:#00f;}
.money2{color:#f00;}
.money3{color:#0f0;}
button{margin-left:30px;} </style> </head> <p id="money1" class="money money1">50000</p> <p id="money2" class="money money2">100000</p> <p id="money3" class="money money3">20000</p> <button id="pauseResume">pauseResume</button> <button id="reset">reset</button> <button id="update">update</button> <script src="jquery.js"></script> <script type="text/javascript" src="countup.js"></script> <script type="text/javascript"> var options = { useEasing: true, useGrouping: true, separator: ',', decimal: '.' }; var money1 = new CountUp('money1', 0, 50000, 0, 3, options), money2 = new CountUp('money2', 0, 100000, 0, 3, options), money3 = new CountUp('money3', 0, 20000, 0, 3, options); money1.start(); money2.start(); money3.start(); //暂停/恢复 $('#pauseResume').click(function(){ money1.pauseResume(); }); //重置动画 $('#reset').click(function(){ money1.reset(); }); //更新一个值 var someValue = 6666; $('#update').click(function(){ money1.update(someValue); }); </script> </body> </html>
参数：
target ： 目标元素的id
startVal ： 你想要开始的值
endVal ： 你想要到达的值
decimals ： 小数位数，默认值为0
duration ： 动画持续时间为秒，默认值为2
options ：选项的可选对象
//options对象参数
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
};
还有几个方法：
//暂停/恢复
money1.pauseResume();
//重置动画
money1.reset();
//更新值
var someValue = 6666;
money1.update(someValue);
附上countUp.js压缩后的源码，就不用去下载啦 ctrl+c ctrl+v 哈哈哈、
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)}};
