实现 setInterva

setTimeout 实现递归实现

const mySetInterval = (cb, time) => {
    const fn = () => {
        cb();
        setTimeout(() => {
            fn();
        }, time);
    }
    fn();
}
mySetInterval(() => {
    console.log(new Date())
}, 1000)

非递归实现

const setInterval1 = (func, interval) => {
    let startTime = Date.now();
    const config = { shouldStop: false };
    while (!config.shouldStop) {
        if (Date.now() - startTime >= interval) {
            func();
            startTime = Date.now();
        }
    }
    return config;
}

const myClearInterval = config => { config.shouldStop = true; }