JS throttling and stabilization functions

First, to achieve a throttling function

@ Idea: triggered only once within a predetermined time
function  Throttle ( Fn, Delay) {
  // closure hold time using
  the let PREV =  Date.now ()
  return  function ( ) {
    the let context =  the this
    the let Arg =  arguments
    the let now =  Date.now ()
    IF (now - PREV> = Delay) {
      fn.apply (context, Arg)
      PREV =  Date.now ()
    }
  }
}

function  Fn ( ) {
  the console.log ( 'throttle')
}
the addEventListener ( 'Scroll', Throttle (Fn,  1000)) 

Second, implement an anti-shake function

@ Ideas: within a predetermined time is not triggered a second time, perform the
function  Debounce ( Fn, Delay) {
  // save timer closure using
  the let Timer =  null
  return  function ( ) {
    the let context =  the this
    the let Arg =  arguments
    / / triggered again within a predetermined period of time to clear the timer will reset the timer before
    the clearTimeout (timer)
    timer = the setTimeout ( function ( ) {
      fn.apply (context, Arg)
    }, Delay)
  }
}

function  Fn ( ) {
  the console.log ( 'shake')
}
the addEventListener ( 'Scroll', Debounce (Fn,  1000))