在Javascript中实现像addClass、removeClass和delay这样的jquery函数

function addClass(element, className) {
    if (element.classList) {
        element.classList.add(className);
    } else {
        element.className += ' ' + className;
    }
}

function removeClass(element, className) {
    if (element.classList) {
        element.classList.remove(className);
    } else {
        element.className = element.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
    }
}

function delay(func, wait) {
    return new Promise(resolve => setTimeout(() => {
        func();
        resolve();
    }, wait));
}

// 获取元素
const element = document.getElementById('myElement');

// 添加类
addClass(element, 'active');

// 延时执行
delay(() => {
    // 移除类
    removeClass(element, 'active');
}, 1000);