<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
window.onload = function (){
var button = document.getElementById('button');
var onOff = 0;
button.onclick = function (){
toggle(
[function (){
alert(1);
},
function (){
alert(2);
},
function (){
alert(3);
},
function (){
alert(4);
}
]
);
}
function toggle( fns ){
/*
接收一个数组形式的函数集合
或者使用arguments形式接收参数
根据onOff的索引调用对应的函数
onOff自增
onOff取余当前数组的长度（函数的个数）
onOff等于当前数组的长度onOff归0
*/
fns[onOff]();
onOff++;
onOff%=fns.length;
}
}
</script>
</head>
<body>
<button id="button">toggle</button>
</body>
</html>
