How to check if webpage page is scrolled? [duplica

问题:

This question already has an answer here:

• How do I determine height and scrolling position of window in jQuery? 4 answers

Is there any way in javascript to check if web page has been vertically scrolled? specially for Internet Explorer? I need to get the mouse position in IE but using jQuery event e.pageY it gives correct value when page is not scrolled but when page is scrolled down then it gives wrong position.

回答1:

Check out this question if you are comfortable with using jQuery:

How do I determine height and scrolling position of window in jQuery?

回答2:

In case any future googlers find this, the quick example is:

if(!$(window).scrollTop()) { //abuse 0 == false :)
  alert("You are at the top of this window");
}