SOURCE

$("#hideBtn").click(function(){
  $("ul li:first-child").hide();
});
 
$("#showBtn").click(function(){
  $("ul li:first-child").show();
});

$(document).ready(function(){
  $("#flip").click(function(){
    $("#panel").slideToggle("slow");
  });
});


$(document).ready(function(){
	$("button").click(function(){
		$("#div1").fadeToggle();
		$("#div2").fadeToggle("slow");
		$("#div3").fadeToggle(3000);
	});
});


$(document).ready(function(){
  $("button").click(function(){
    $("#div1").fadeTo("slow",0.15);
    $("#div2").fadeTo("slow",0.4);
    $("#div3").fadeTo("slow",0.7);
  });
});

$(document).ready(function(){
  $("button").click(function(){
    var div=$("div");
    div.animate({height:'300px',opacity:'0.4'},"slow");
    div.animate({width:'300px',opacity:'0.8'},"slow");
    div.animate({height:'100px',opacity:'0.4'},"slow");
    div.animate({width:'100px',opacity:'0.8'},"slow");
  });
});

<h1>Heading</h1>
<p>jhyghg</p>
<p>Paragraqph</p>
<ul>
  <li>a1</li>
  <li>fyh</li>
</ul>
<ul>
  <li>a2</li>
  <li>gfhyt</li>
</ul>
<button id="showBtn">显示</button>
<button id="hideBtn">隐藏</button>

<div id="flip">点我，显示或隐藏面板。</div>
<div id="panel">Hello world!</div>

<p>实例演示了 fadeToggle() 使用了不同的 speed(速度) 参数。</p>
<button>点击淡入/淡出</button>
<br><br>
<div id="div1" style="width:80px;height:80px;background-color:red;"></div>
<br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div>
<br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>


<p>演示 fadeTo() 使用不同参数</p>
<button>点我让颜色变淡</button>
<br><br>
<div id="div1" style="width:80px;height:80px;background-color:red;"></div><br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>

<button>开始动画</button>
<p>默认情况下，所有的 HTML 元素有一个静态的位置，且是不可移动的。 
如果需要改变为，我们需要将元素的 position 属性设置为 relative, fixed, 或 absolute!</p>
<div style="background:#98bf21;height:100px;width:100px;position:absolute;">
</div>

#panel,#flip
{
	padding:5px;
	text-align:center;
	background-color:#e5eecc;
	border:solid 1px #c3c3c3;
}
#panel
{
	padding:50px;
	display:none;
}