插件-js实现动态时钟效果

<div id="updatetime"></div>
const updateTime = () => {
    var now = new Date();

    var year = now.getFullYear();
    var month = now.getMonth() + 1; // getMonth() 返回 0-11
    var day = now.getDate();
    var hours = now.getHours();
    var minutes = now.getMinutes();
    var seconds = now.getSeconds();

    // 补零操作
    month = month < 10 ? '0' + month : month;
    day = day < 10 ? '0' + day : day;
    hours = hours < 10 ? '0' + hours : hours;
    minutes = minutes < 10 ? '0' + minutes : minutes;
    seconds = seconds < 10 ? '0' + seconds : seconds;

    var dateTimeString = year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds;
    $("#updatetime").text(dateTimeString + " GMT+8 (中国标准时间)");
}
updateTime();
setInterval(updateTime, 1000);