homework/14/script.js

const delay = ms => new Promise(ok => setTimeout(() => ok(ms), ms))

async function trafficLight(dom) {

    dom = document.getElementById('light1')
    let green = document.getElementById('green')
    let red = document.getElementById('red')
    let yellow = document.getElementById('yellow')

    while (true) {

        red.style.visibility = 'visible'
        green.style.visibility = 'hidden'
        yellow.style.visibility = 'hidden'
        await delay(3000)

        yellow.style.visibility = 'visible'
        green.style.visibility = 'hidden'
        red.style.visibility = 'hidden'
        await delay(1000)

        green.style.visibility = 'visible'
        red.style.visibility = 'hidden'
        yellow.style.visibility = 'hidden'
        await delay(3000)

        yellow.style.visibility = 'visible'
        green.style.visibility = 'hidden'
        red.style.visibility = 'hidden'
        await delay(1000)

    }
}

trafficLight();

//trafficLight2

function domEventPromise(element, eventName) {
    return new Promise((resolve, reject) => {
        element.addEventListener(eventName, (e) => {
            resolve(e)
            trafficLight2(e)
        })
        element.removeEventListener(eventName, (e) => {
            resolve(e)
            trafficLight2(e)
        })
    })

}

async function trafficLight2() {

    while (true) {
        if (true) {
            red1.style.visibility = "hidden";
            green1.style.visibility = "visible";
            btn.disabled = true;
            await delay(4000);
            btn.disabled = false;
            await Promise.race([
                delay(1000),
                domEventPromise(btn, "click").then((e) =>
                    console.log("event click happens", e)
                ),
            ]);
        }
        if (true) {
            btn.disabled = true;
            green1.style.visibility = "hidden";
            red1.style.visibility = "visible";
            await delay(5000);
        }
    }
}

trafficLight2()