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                            ~~~
//當用戶滾動鼠標時觸發的函數
  onPageScroll: function (ev) {
    var _this = this;
    //當滾動的top值最大或者最小時，為什么要做這一步是由于在手機實測小程序的時候會發生滾動條回彈，所以為了解決回彈，設置默認最大最小值   
    if (ev.scrollTop <= 0) {
      ev.scrollTop = 0;
    } else if (ev.scrollTop > wx.getSystemInfoSync().windowHeight) {
      ev.scrollTop = wx.getSystemInfoSync().windowHeight;
    }
    //判斷瀏覽器滾動條上下滾動   
    if (ev.scrollTop > this.data.scrollTop || ev.scrollTop == wx.getSystemInfoSync().windowHeight) {
        console.log('向下滾動');   
       } else {
        console.log('向上滾動');  
        }  
      //給scrollTop重新賦值    
      setTimeout(function () {
        _this.setData({
          scrollTop: ev.scrollTop
        })
      }, 0)

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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