js dynamically move the scroll bar to the bottom sample code_javascript skills

复制代码 代码如下:

var currentPosition,timer;
function GoBottom(){
timer=setInterval("runToBottom()",50);
}
function runToBottom(){
currentPosition=document.documentElement.scrollTop || document.body.scrollTop;
currentPosition =30;
if(currentPosition{
//window.scrollTo(0,currentPosition);
//alert(document.documentElement.clientHeight " " document.documentElement.scrollTop " " document.documentElement.scrollHeight "#" document.body.clientHeight " " document.body.scrollTop " " document.body.scrollHeight);
document.body.scrollTop = currentPosition;
}
else
{
document.body.scrollTop = document.body.scrollHeight;
clearInterval(timer);
}
}