去重和数组排序

<script type="text/javascript">	
        var a = [2,3,3,4,5,3,2,6,7,3];
        var b = [];
        for(var i=0;i<a.length;i++)
	{
		var s=0
		for(var j=0;j<b.length;j++)	
		{			
			if(a[i]==b[j])
			{
				s=1	
			} 	
		}
		if(s==0)
		{
			b.push(a[i])	
		}
	}
	alert(b)
</script>	

<script type="text/javascript">	
	var a = [2,3,3,4,5,3,2,6,7,3];
	var b = [];
	C(a);
	function C(a)
	{
		for(var i=0;i<a.length;i++)
		{
			if(a.indexOf(a[i])==i)
			{
				b.push(a[i])
			}
		}
	}
	document.write(b)
</script>	

<script type="text/javascript">
       var attr=[7,8,9,3,2,1,5,6,4]
	var zj=0
	for(var i=0;i<attr.length-1;i++)
	{
		for(var j=0;j<attr.length-1;j++)
		{
			if(attr[j]>attr[j+1])
			{
				zj=attr[j]
				attr[j]=attr[j+1]
				attr[j+1]=zj
			}	
		}	
	}
	alert(attr)
</script>