有这么个需求：求n个数中最大数，

<script type="text/javascript">
    function maxNumber(){
    	var maxNumber = arguments[0];
    	for (var i = arguments.length - 1; i >= 0; i--) {
    		if(arguments[i] > maxNumber){
    			maxNumber =arguments[i];
    		}
    	}
    	return maxNumber;
    }
    var maxValue = maxNumber(1,2,3,4,45,5,3333);
    document.write(maxValue);
</script>