How to set scroll bar position in javascript

How to set the scroll bar position in javascript: 1. Put the vertical scroll bar at the top, the code is [(window.scrollTo(0,0);]]; 2. Put the vertical scroll bar at the bottom, the code is [window .scrollTo(0,document.body.scrollHeight)】.

How to set the scroll bar position in javascript:

window.scrollTo(x,y);

document.getElementByIdx_x('textarea').scrollTop = document.getElementByIdx_x('textarea').scrollHeight

function getScrollTop(){
var scrollTop=0;
if(document.documentElement&&document.documentElement.scrollTop){
scrollTop=document.documentElement.scrollTop;
}else if(document.body){
scrollTop=document.body.scrollTop;
}
return scrollTop;
}

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