SOURCE

function debouce(fn, deay){
    let timer = null;
    return function(){
        clearTimeout(timer)
        timer = setTimeout(() => {
            fn.apply(this, arguments)
        }, deay)
    }
}

function throttle(fn, time){
    let lastTime = 0;
    return function(){
        const nowTime = new Date().getTime()
        if( nowTime - lastTime >= time) {
            fn.apply(this, arguments);
            lastTime = nowTime
        }
    }
}

function testDebouce(a) {
    console.log('debounce', a)
}
let aa = debouce(testDebouce, 300)
aa(1)
setTimeout(() => aa(2), 400)
setTimeout(() => aa(3), 400)

function testThrottle(a) {
    console.log('throttle', a)
}
let bb = throttle(testThrottle, 4)
bb(1)
setTimeout(() => bb(2), 4)
setTimeout(() => bb(3), 4)