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                            # scroll 滾動問題

> document.body.scrollTop 一直無效的原因是因為滾動條是html提供的。
> 又因為html的高度是body撐開的。所以兩者的高度相等。
> 所以document.body.scrollTop 的值一直是0。
> 


解決方案：
~~~
document.documentElement.scrollTop 替代document.documentElement.scrollTop

document.documentElement 是指代html標簽的
~~~


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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