js实现数字滚动特效

本文实例为大家分享了js实现数字滚动展示的具体代码,供大家参考,具体内容如下

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效果图

js实现数字滚动特效

html代码




  
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js代码

let numchange = function (){
  let point = '.'
  // 数字容器高度
  let height = 60
  // 每次滚动距离/滚动速度
  let p = 3
  // 数字spanclass
  let spanClass = 't-num-s'
  // 数字divclass
  let divClass = 't-num'
//
  let cache = {}
  function createDiv(id, num, len, paddingNum){
    let str = ''
    for (let i = 0; i < len; i++) {
      str += `
${paddingNum === undefined?num[i]:paddingNum}
` } return str } function initZero(id, count){ document.getElementById(id).innerHTML = createDiv(id,null,count,0) } function refresh(oldNum, newNum, id){ let len = newNum.length - oldNum.length; for (let i = 0; i < len; i++) { oldNum.unshift('0') } document.getElementById(id).innerHTML = createDiv(id,oldNum,oldNum.length) } function refresh2(oldNum, newNum, id){ let len = oldNum.length - newNum.length; for (let i = 0; i < len; i++) { oldNum.shift() } document.getElementById(id).innerHTML = createDiv(id,oldNum,oldNum.length) } function scrollNum(id, num, order){ let h = num * height let e = document.getElementById(id) let t = setInterval(() => { let m = e.scrollTop; m = m + p if(m > h){ clearInterval(t) let cs = e.children for (let i = cs.length-2; i >= 0; i--) { e.removeChild(cs[i]) } return } e.scrollTop = m }, 10) } function createSpan(num){ let span = document.createElement('span') span.className = spanClass span.innerText = num return span } function appendNum(id, start, end){ let f = document.createDocumentFragment() let count = 0 if(start === end && isNaN(start)){ return 0 } if(isNaN(start) && !isNaN(end)){ for (let i = 0; i <= end; i++) { f.appendChild(createSpan(i)) count++ } document.getElementById(id).appendChild(f) return count } if(!isNaN(start) && isNaN(end)){ for (let i = start+1; i <= 9; i++) { f.appendChild(createSpan(i)) count++ } f.appendChild(createSpan('.')) count++ document.getElementById(id).appendChild(f) return count } if(start < end){ for (let i = start+1; i <= end; i++) { f.appendChild(createSpan(i)) count++ } }else if(start > end){ for (let i = start+1; i <= 9; i++) { f.appendChild(createSpan(i)) count++ } for (let i = 0; i <= end; i++) { f.appendChild(createSpan(i)) count++ } }else{ return 0 } document.getElementById(id).appendChild(f) return count } /** * @param id 容器id * @param num 展示的数字 */ function change(id, num){ console.log(num) let strArr = num.toString().split(''); let oldNum = cache[id] // 如果没有缓存,开始数字全部填充0 if(!oldNum){ initZero(id,strArr.length) oldNum = [] }else{ oldNum = cache[id].toString().split('') // 如果新数字长,原来数字左侧填充0 if(oldNum.length < strArr.length){ refresh(oldNum, strArr, id) // 如果新数字短,原来数字左侧移除 }else if(oldNum.length > strArr.length){ refresh2(oldNum, strArr, id) } } // 循环比较每个数字差异,添加需要滚动的数字列 for (let i = 0, len = strArr.length; i < len; i++) { let start = oldNum[i] !== point ? parseInt(oldNum[i]||0) : oldNum[i] let end = strArr[i] !== point ? parseInt(strArr[i]||0) : strArr[i] let count = appendNum(id+i, start, end) if(count > 0){ // 数字滚动 scrollNum(id+i, count, i+1) } } cache[id] = num } function config(param){ if(param.p){ p = param.p } if(param.height){ height = param.height } if(param.spanClass){ spanClass = param.spanClass } if(param.divClass){ divClass = param.divClass } return scroll } let scroll = { change: change, config: config } return scroll }

遗留问题:setInterval方法在切换页面后,会变快。解决方案1:用setTimeout代替setInterval。2.requestAnimFrame

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