js实现从0到指定数据的跳动

const $setJumpNum = (startNum,targetNum,time=1,selector) =>{
        var dom = document.querySelector(selector)
        var originNum = startNum
        var stepNum = 0
        var timeNum = time
        dom.innerHTML = startNum;

        let timeId = setInterval(()=>{
            if(originNum < targetNum) {
                timeNum -=0.001;
                let strNum = originNum.toString()
                // 由于数字很大直接+1要很久才能调到对应数字，所有后三位数随机生成
                if(targetNum.toString.length < 6){
                    stepNum += 1 //这样可以实现越跳越快的效果
                    originNum = originNum + stepNum;
                    dom.innerHTML = originNum
                } else {
                    stepNum += 500 //实现大数越跳越快
                    originNum = originNum + stepNum
                    // 不直接处理originNum，交给strNum处理大数跳动的数值
                    dom.innerHTML = strNum.substr(0,strNum.length-3) + Math.floor(Math.random()*10) +  Math.floor(Math.random()*10) + Math.floor(Math.random()*10);
                }
            } else {
                dom.innerHTML = targetNum
                clearInterval(timeId)
            }
        },timeNum)
    }
 function start(data){
        $setJumpNum(0,data.Policy,60,'.zc')
        $setJumpNum(0,data.ClinicalTestCount,1,'.lcsy')
        $setJumpNum(0,data.InciteList,60,'.gl')
        $setJumpNum(0,data.DrugCount,1,'.china')
        $setJumpNum(0,data.NDC ,1,'.usa')
        $setJumpNum(0,data.DiseaseClinicalGuidelines,40,'.lczn')
    }
start