红绿灯问题

题目∶红灯三秒亮一次，绿灯一秒亮一次，黄灯2秒亮一次;如何让三个灯不断交替重复亮灯?(用Promse 实现)

function red() { console.log("red") }
function green() { console.log("green") }
function yellow() { console.log("yellow") }

'function minOperations() { Promise.resolve().then(() => { return new Promise((a, b) => { setTimeout(() => { a(1) }, 3000) }) }).then(() => { red(); return new Promise((a, b) => { setTimeout(() => { a(1) }, 2000) })

}).then(() => {
    green(); return new Promise((a, b) => {
        setTimeout(() => { a(1) }, 1000)
    })
}).then(() => {
    yellow();
    minOperations();
})

};'