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返回值:jQueryfadeTo([[speed],opacity,[easing],[fn]])

概述

把所有匹配元素的不透明度以渐进方式调整到指定的不透明度,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,opacity,[fn]Number/String,Number,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)

opacity:一个0至1之间表示透明度的数字。

fn:在动画完成时执行的函数,每个元素执行一次。

[speed],opacity,[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)

opacity:一个0至1之间表示透明度的数字。

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:

使用淡入效果来显示一个隐藏的 <p> 元素:

jQuery 代码:
$(".btn2").click(function(){
  $("p").fadeIn();
});

描述:

用600毫秒缓慢的将段落的透明度调整到0.66,大约2/3的可见度

jQuery 代码:
$("p").fadeTo("slow", 0.66);

描述:

用200毫秒快速将段落的透明度调整到0.25,大约1/4的可见度,之后弹出一个对话框

jQuery 代码:
$("p").fadeTo("fast", 0.25, function(){
   alert("Animation Done.");
 });
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