学步园

代码：

<script type="text/javascript">

	
	function getCal(numbers,calValue){
		for(var i=0,j=numbers.length-1;i<j;){
			var start = numbers[i];
			var end = numbers[j];
			if(start+end==calValue){
				alert(start+"+"+end);
				i++;
				j--;
			}else if(start+end<calValue){
				i++;
			}else if(start+end>calValue){
				j--;
			}
		}
	}
	
	var numbers = [1,3,4,5,12,15,18,19,21,25,31];
	var calValue = 22;
	getCal(numbers,calValue);
</script>