scrollview轻轻一拉就触发@refresherrefresh事件，导致无法向上滚动

// 下拉刷新  
handle_refresh(){  
    // 防止重复执行  
    if (this.refreshing) return;    
    this.refreshing = true  
    if(!this.triggered){  
        this.triggered = true  
        this.get_list()  
        setTimeout(()=>{  
            this.triggered = false  
            this.refreshing = false;    
        }, 1000)  
    }  
},