countUp.js-数字滚动效果（简单基础使用）

　　最近写了个移动端宣传页，里面有数字的效果，所以有使用到countUp.js。

　　以下内容有包括：h5页面countUp.js的引入和实例、参数说明、事件简单使用和描述、countUp.js源代码。

　　附上countUp.js的gitHub地址：http://inorganik.github.io/countUp.js/  

• 效果

　　

 

 

• 重点部分-参数

　　

• h5页面代码

    
    
    
    
    
    


    
数字一：
    
开始暂停重置更新值
    
数字二：

• countUp.js

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;xif(!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;iif(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.frameValelse{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(progressself.endVal);self.rAF=requestAnimationFrame(self.count)};if(self.initialize()){self.printValue(self.startVal)}};