好的,我将尝试解释这一点,但这有点困难。说我有一些这样的html,
<div id="wrapper">
<div id="scroll">
<!--content-->
</div>
</div>
现在,#wrapper 有一个设定的高度,比如 500 像素,而 #scroll 有一个更长的高度,比如 3000 像素。
var hoverInterval, yPos, offset, objHeight
$("#wrapper").mousemove(function(e){
//when the mouse moves in #wrapper, find the height of the object
//and the relative position of the mouse within the object.
objHeight = this.offsetHeight
yPos = e.pageY - this.offsetTop;
});
$("#wrapper").hover( //when the user hovers w/i #wrapper...
function(){
hoverInterval = setInterval(function(){
factor = (100*yPos)/objHeight //gives a range from 0-100
move = ( -3+( ( Math.pow(factor-50,2))/56))/8
/*this provides a bell curve, so that as
*the user hovers closer to the extremes,
*/#scroll will scroll faster up and down.
if ( move > 0 ) { //prevents movement when in the middle
if (yPos <= objHeight*.5 ) {
$("#photos").animate(
{"top":"+="+move+"px"},"slow","easeOutExpo")
.stop("true","true")
}
else if (yPos >= objHeight*.5){
$("#photos").animate(
{"top": "-="+move+"px"},"slow","easeOutExpo")
.stop("true","true")
}
}
},10); //setInterval's timeout
},
function(){ //and stop at mouse off.
clearInterval(hoverInterval)
}
);
现在这样做是,当用户在#wrapper 中悬停更高或更低时,#scroll 滚动得更快,中间有一个死区。但是当用户滚动离开#wrapper 时,它会突然停止。当用户停止将鼠标悬停在#wrapper 上时,关于如何优雅地停止此操作的任何想法?
也欢迎对我的代码进行优化。