jQuery Callback 方法

JQuery animation issues

Many jQuery functions involve animation. These functions may take speed or duration as optional parameters.

Example: $("p").hide("slow")

The speed or duration parameter can be set to many different values, such as "slow", "fast", "normal" or milliseconds.

Example

The following example has a callback function after the hiding effect is fully realized:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("p").hide("slow",function(){
      alert("段落现在被隐藏了");
    });
  });
});
</script>
</head>
<body>
<button>隐藏</button>
<p>点击“隐藏”按钮我就会消失</p>
</body>
</html>

The following example has no callback function, and the warning box will pop up before the hiding effect is completed:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("p").hide(1000);
    alert("现在段落被隐藏了");
  });
});
</script>
</head>
<body>
<button>隐藏</button>
<p>这是一个段落</p>
</body>
</html>

Next Section

new file

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>php中文网(php.cn)</title> 
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
 <style type="text/css">
 body{font-family: "微软雅黑";width: 420px; margin: 0 auto; text-align: center;}
		.box{
			width: 200px;
			height: 200px;
			background: green;
			border: 1px solid #e6e6e6;
			margintop: 50px;
			line-height: 200px;
			position: absolute;
		}
		button{
			border: none;
			background: green; 
			width: 100px;
			height: 50px;
			line-height: 50px;
			color: #fff;
			font-size: 16px;
			margin-top: 50px;
		}
 </style>
</head>
<body>
 <button>点击开始动画</button>
 <div class="box" ></div>
 <script> 
 $(document).ready(function(){
 $("button").click(function(){
 var div=$(".box");
 div.animate({height:'200px',opacity:'0.4'},"slow");
 div.animate({width:'200px',opacity:'0.8'},"slow");
 div.animate({height:'100px',opacity:'0.4'},"slow");
 div.animate({width:'100px',opacity:'0.8'},"slow");
 div.animate({right:'100px',opacity:'0.8'},"slow");
 div.animate({bottom:'100px',opacity:'0.8'},"slow");
 div.animate({left:'100px',opacity:'0.8'},"slow");
 div.animate({top:'100px',opacity:'0.8'},"slow",function(){
 alert("The paragraph is over");
 });
 });
 });
 </script> 
 <script>
 $(document).ready(function(){
 $("button").click(function(){
 var div=$(".box");
 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",function(){
 alert("The paragraph is over");
 　　　　 });
 });
 });
 });
 </script>
</body>
</html>

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