我一直在使用composition API在vue 3的watch函数中触发debounce函数时遇到麻烦。我让它在选项API中工作。watch函数正在工作（只是不是watcher内部的debounce函数）。

setup() {
  const handleDebounce = (fn, delay) => {
    console.log('test') // this works
    var timeoutID = null
    return function () {
      console.log('test') // this does not work
      clearTimeout(timeoutID)
      var args = arguments
      var that = this
      timeoutID = setTimeout(function () {
        fn.apply(that, args)
      }, delay)
    }
  }

  watch(
    () => watched.value,
    input => {
      //doesn't work
      handleDebounce(function (t) {
        console.log(t)
      }, 3000)
    }
  )
}

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