查询数组中第一个大于给定数的元素的索引号

var arr:Array=[1,33,5,7,8,12,4];
trace(getIndex(9,arr));

function getIndex(currentValue:Number,arr:Array):int {
	var flag:Boolean=true;
	var firstMatchIndex:int;
	
	var num:int=arr.length;
	for (var i:int=0; i<num; i++) {
		if (currentValue<arr[i]) {
			if (flag) {
				flag=false;
				firstMatchIndex=i;
			}
		}
	}
	if (currentValue>arr[num-1]) {
		firstMatchIndex=num-1;
	}
	
	return firstMatchIndex;
}