vue better-scroll 下拉上拉，加载刷新

_initScroll(){

            this.$nextTick(() => {

                if (!this.scroll) {

                    this.scroll = new BScroll(this.$refs.bscroll, {

                        click: true,

                        scrollY: true,

                        probeType: 3

                    });

                }else{

                    this.scroll.refresh();

                }

                this.scroll.on('scroll', (pos) => {

                    console.log(pos.y,this.dropDown)

                    //如果下拉超过50px 就显示下拉刷新的文字

                    if(pos.y>50){

                        　　　　// 显示刷新的element  this.xxx = true;

                    }else{

                      // 隐藏刷新的element  this.xxx = false;

                    }

                })

                //touchEnd（手指离开以后触发） 通过这个方法来监听下拉刷新

                this.scroll.on('touchEnd', (pos) => {

                    // 下拉动作

                    if(pos.y > 50){

                        console.log("下拉刷新成功")

                        // 隐藏刷新的element   this.xxx = false;

                    }

                    //上拉加载 总高度>下拉的高度+10 触发加载更多

                    if(this.scroll.maxScrollY>pos.y+10){

                        console.log("加载更多")

                        //使用refresh 方法 来更新scroll  解决无法滚动的问题

                        this.scroll.refresh()

                    }

                    console.log(this.scroll.maxScrollY+"总距离----下拉的距离"+pos.y)

                })

                console.log(this.scroll.maxScrollY)

            });

        }