vue監聽滾動條-吸頂

mounted(){
    window.addEventListener('scroll', this.handleScroll)
}


handleScroll () {
    var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
    console.log(scrollTop)
    if(scrollTop > 45){
      this.isFixed = true;
    }else{
      this.isFixed = false;
    }
},