js 函数节流、防抖

新建index.js将下面代码复制到index.js中

/**
 * 函数防抖 (只执行最后一次点击)
 * @param fn
 * @param delay
 * @returns {Function}
 * @constructor
 */
const debounce = (fn, t) => {
  let delay = t || 300
  let timer
  return function () {
    let args = arguments
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(() => {
      fn.apply(this, args) // this 指向vue
    }, delay)
  }
}
/**
 * 函数节流
 * @param fn
 * @param interval
 * @returns {Function}
 * @constructor
 */
const Throttle = (fn, t) => {
  let last
  let timer
  let interval = t || 500
  return function () {
    let args = arguments
    let now = +new Date()
    if (last && now - last < interval) {
      clearTimeout(timer)
      timer = setTimeout(() => {
        last = now
        fn.apply(this, args)
      }, interval)
    } else {
      last = now
      fn.apply(this, args)
    }
  }
}
export default {
  debounce,
  Throttle
}