For example:
Css: Assume the following simple settings;
html{height:1000px;}
JS:
function(){
window.scrollBy(0,100);
alert(window.pageYOffset);
}
Results:
//Pop up after clicking once: 100; the result is a numerical value, read-only attribute; value: Integer (integer), default: 0;
Note: When the scroll bar When reaching the bottom of the page, window.pageYOffset=1000-document.documentElement.clientHeight;
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
