methods：{
	Scrollbottom () { 
		let scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
		let clientHeight = document.documentElement.clientHeight;
		let scrollHeight = document.documentElement.scrollHeight;
		if (scrollTop + clientHeight >= scrollHeight) {
		    console.log("滚动到底部了")
	    }
	},
}，
created(){
  window.addEventListener('scroll', this.Scrollbottom);
},
destroyed() { 
  window.removeEventListener('scroll', this.Scrollbottom)//页面离开后销毁监听事件
},

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