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>