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slideToggle([speed],[easing],[fn])
概述
通过高度变化来切换所有匹配元素的可见性，并在切换完成后可选地触发一个回调函数。
这个动画效果只调整元素的高度，可以使匹配的元素以“滑动”的方式隐藏或显示。在jQuery 1.3中，上下的padding和margin也会有动画，效果更流畅。
参数
speed[,fn]Number/String,FunctionV1.0
speed:三种预定速度之一的字符串("slow","normal", or "fast")或表示动画时长的毫秒数值(如：1000)
fn:在动画完成时执行的函数，每个元素执行一次。
[speed],[easing],[fn]Number/String,String,FunctionV1.4.3
speed:三种预定速度之一的字符串("slow","normal", or "fast")或表示动画时长的毫秒数值(如：1000)
easing:(Optional) 用来指定切换效果，默认是"swing"，可用参数"linear"
fn:在动画完成时执行的函数，每个元素执行一次。
示例
描述:
用600毫秒缓慢的将段落滑上或滑下
jQuery 代码:
$("p").slideToggle("slow");描述:
用200毫秒快速将段落滑上或滑下，之后弹出一个对话框
jQuery 代码:
$("p").slideToggle("fast",function(){
alert("Animation Done.");
});