運行結果如下：
<!DOCTYPE html>
<head>
<title>js實現數字跳動到指定數字</title>
<style>
h1 {font-size: 150px;text-align:center;}
p {text-align:center;}
button {font-size:40px;}
</style>
</head>
<body>
<h1 id="number">0</h1>
<p>
<button οnclick="start()">開始計數</button>
</p>
</body>
<script>
/*
* startNum 代表要跳動的初始數字
* targetNum 代表要跳動到的數字
* time 代表要跳動需要花費的時間
* selector 代表要跳動元素的選擇器
*/
const $setJumpNumber = (startNum, targetNum, time = 1, selector) => {
let dom = document.querySelector(selector);
let originNum = startNum;
let stepNum = 0;
let timeNum = time;
dom.innerHTML = startNum;
let timeId = setInterval(() => {
if (originNum < targetNum) {
timeNum -= 0.001;
let strNum = originNum.toString();
// 數字比較少的時候直接用 + 1; 數字很大直接 +1 要很久才能調到最對應的數字，所有後三位數隨機跳動的方式進行模擬生成
if (targetNum.toString().length < 6) {
stepNum += 1; // 這樣纔可以實現越跳越快的效果
originNum = originNum + stepNum;
dom.innerHTML = originNum;
} else {
stepNum += 500; // 這樣纔可以實現越跳越快的效果
originNum = originNum + stepNum;
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 () {
$setJumpNumber(11, 218983423, 1, 'h1');
};
</script>
</html>