vue 實現滾動到頁面底部開始加載更多

scrollTop 頁面滾動的高度，

clientHeight 可視區域高度

scrollHeight 可滾動內容的高度

 

mounted(){

　　// 添加滾動事件，檢測滾動到頁面底部

    window.addEventListener('scroll', this.scrollBottom)

  },

// 滾動到頁面底部時，請求內容
scrollBottom() {
        this.loading = false
        let scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
	      let clientHeight = document.documentElement.clientHeight;
	      let scrollHeight = document.documentElement.scrollHeight;
        let bottomOfWindow = scrollTop + clientHeight >= scrollHeight-4
        console.log(scrollHeight)
        if (scrollTop!=0&&bottomOfWindow && this.loading == false &&this.finished == false) {
          this.loading = true
          this.offset = this.offset + this.limit; 
          let param = {
            offset: this.offset,
            limit: this.limit
          }
          getArea(param).then((res) => {
            if (res.code == 200) {
              this.loading = false
              this.area = this.area.concat(res.data); //追加數據
              if (res.data.length == 0) {
                //數據全部加載完成
                this.finished = true;
              } else {
                this.finished = false;
              }
            }
      	  })
        }
    }