JS手撕防抖和节流

//防抖
const debounce_ = function (fn, wait) {
    let timer
    return function () {
        if (!fn) clearTimeout(timer)
        timer = setTimeout(() => {
            fn()
            clearTimeout(timer)
        }, wait)
    }
}
//节流
const throttle_ = function(fn,wait){
    let timer = 0
    return function(){
        if(Date.now-timer>wait){
            fn()
            timer = Date.now()
        }
    }
}