A callback is a function that is passed as an argument to another function and is executed after its parent function has completed.
<html>
<head>
<title>回调函数(callback)</title>
<script language="javascript" type="text/javascript">
function a(callback)
{
alert("我是函数a，下面开始回调函数");
callback();
}
function b(){
alert("我是回调函数b");
}
function c(){
alert("我是回调函数c");
}
function d(){
alert("我是回调函数d");
}
function test()
{
a(b);
a(c);
a(d);
}
</script>
</head>
<body>
<h1>javascript callback</h1>
<button onClick=test()>click me</button>
</body>
</html>
利用回调，方便灵活！
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