$(window)
.on("scrollstart", function() {
// Paint the world yellow when scrolling starts.
$(document.body).css({background: "yellow"});
})
.on("scrollstop", function() {
// Paint it all green when scrolling stops.
$(document.body).css({background: "green"});
});
https://github.com/ssorallen/jquery-scrollstop
开始滚动和停止滚动的时候 会发出事件