m_throttle/index.js

节流/防抖

// 定时器 + 时间戳版本
// 下面我们来个加强版本的, 这个版本是结合了定时器和时间戳, 在我们鼠标移出监听区域后, 还会再执行一次函数
module.exports.throttle = (fn, wait) => {
    let time = 0, timer = null
    return function () {
        let now = Date.now()
        let args = arguments
        if (now - time > wait) {
            fn.apply(this, args)
            time = now
        } else {
            timer && clearTimeout(timer)
            timer = setTimeout(() => {
                fn.apply(this, args)
                time = now
            }, wait)
        }
    }
}

module.exports.debounce = (fn, delay) => {
    let timer = null
    return function () {
        let args = arguments
        clearTimeout(timer)
        timer = setTimeout(() => {
            fn.apply(this, args)
        }, delay)
    }
}