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fadeOut([speed],[easing],[fn])
概述
通过不透明度的变化来实现所有匹配元素的淡出效果，并在动画完成后可选地触发一个回调函数。
这个动画只调整元素的不透明度，也就是说所有匹配的元素的高度和宽度不会发生变化。
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毫秒缓慢的将段落淡出
jQuery 代码:
$("p").fadeOut("slow");描述:
用200毫秒快速将段落淡出，之后弹出一个对话框
jQuery 代码:
$("p").fadeOut("fast",function(){
alert("Animation Done.");
});