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Possible Duplicate:
How to detect page scroll to a certain point in jQuery?
Check if element is visible after scrolling
我如何检测用户何时到达此 div:
<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
<div id="theTarget">I have been reached</div>
编辑
得到这个问题的答案:
Check if element is visible after scrolling
所以我只是这样做了:
function isScrolledIntoView(elem)
{
var docViewTop = $(window).scrollTop();
var docViewBottom = docViewTop + $(window).height();
var elemTop = $(elem).offset().top;
var elemBottom = elemTop + $(elem).height();
return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom) && (elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
$(window).scroll(function() {
if(isScrolledIntoView($('#theTarget')))
{
alert('visible');
}
});