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How to get the value of the scroll bar by encapsulating scroll.js

不言Original: 2018-07-14 15:38:171480browse

This article mainly introduces how to obtain the value of the scroll bar by encapsulating scroll.js. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

function Obj(){}

Obj.prototype={
 
    scroll:function(){

     /*
      主要是做兼容处理
    
     这里必须时!=null 因为默认值和每次滚动的时侯  都可以值为0
     但是 if(0)为假  所以就只要不为null 就执行
                                                              */
     if(window.pageYOffset!=null){
         /*IE9 和其他标准浏览器*/
   return  {
       left:window.pageXOffset,
       top:window.pageYOffset
   }
   

   }
    /*声明了<!DOCTYPE html> */
  else if(document.compatMode=="CSS1Compat")
{

  return{
       left:document.documentElement.scrollLeft,
       top:document.documentElement.scrollTop

    }  

 }

else{

   return {
      left:document.body.scrollLeft,
      top:document.body.scrollTop

    }    

}


   }

}var obj=new Obj();

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