写一个 mySetInterVal(fn, a, b),每次间隔 a,a+b,a+2b,...,a+nb 的时间，然后写一个 myClear，停止上面的 mySetInterVal
function mySetInterval(fn, a, b) {
let timer = null, count = 0;
const start = () => {
timer = setTimeout(() => {
fn()
count++
start()
}, a + count++ * b)
}
const stop = () => {
clearTimeout(timer)
timer = null;
}
return {start, stop}
}
const {start, stop} = mySetInterval(() => {console.log(123), 1000, 2000})
setTimeout(() => {
stop()
}, 10000)
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