函数的节流与防抖

/*
* 函数节流
*/
function throttle(fn, wait) {
    let last = 0
    let dur = wait || 400
    return function() {
        let self = this
        const current_time = new Date()
        if(current_time - last > dur) {
            fn.apply(self, arguments)
            last =+ new Date()
        }
    }
}

/*
* 函数防抖
*/
function throttle(fn, wait) {
    let timer
    let dur = wait || 400
    return function() {
        clearTimeout(timer)
        let self = this
        let args = arguments
        timer = setTimeout(function() {
            fn.apply(self, args)
        }, dur)
    }
}