让链接必须按先后顺序点击的JS代码

<title>让链接必须按先后顺序点击的JS代码</title> 
<script language="JavaScript"> 
var num = 2; 
var mypage = '/tools'; 
var pissoff = ' 请先点击上面链接 '; 
allow = Array(); 
allow[num] = 2; 
function gotoit(link){ 
if (link != num){ 
allow[link] = 2; 
} else { 
for (i=1;i<=num;i++){ 
if (allow[i] != 2){ 
i = num + 1; 
lemmeIn = 0; 
} else { 
lemmeIn = 1; 
} 
} 
if (lemmeIn == 1){ 
window.location = mypage; 
} else { 
alert(pissoff); 
} 
} 
} 
//---> 
</script> 
如需引入外部Js需刷新才能执行]</div>

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