JavaScript排序算法——快速排序 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>快速排序</title>
<!--<link rel="stylesheet" type="text/css" href="../style/fdt.css" />-->
<script type="text/javascript" src="../js/jquery-1.6.2.min.js"></script>
<script type="text/javascript" src="../js/jquery.easydrag.handler.beta2.js"></script>
<script type="text/javascript">

	$(document).ready(
		function() { 
			
			var array_1 = [4,5,3,1,2];
			alert(array_1);
			/*quickSort*/
		    alert(quickSort(array_1));

		}
	); 



</script>

<style type="text/css">
	
	* { padding:0; margin:0; }

	body {
		padding: 100px;
		font-size: 15px; 
	}

	


</style>


<script type="text/javascript">
	function quickSort(array){
		//var array = [8,4,6,2,7,9,3,5,74,5];
		//var array = [0,1,2,44,4,324,5,65,6,6,34,4,5,6,2,43,5,6,62,43,5,1,4,51,56,76,7,7,2,1,45,4,6,7];
		var i = 0;
		var j = array.length - 1;
		var Sort = function(i, j){
			
			// 结束条件
			if(i == j ){ return };
			
			var key = array[i];
			var stepi = i; // 记录开始位置
			var stepj = j; // 记录结束位置
			
			while(j > i){
				alert(array);
				// j <<-------------- 向前查找
				if(array[j] >= key){
					j--;
				}else{
					array[i] = array[j]
					//i++ ------------>>向后查找
					while(j > ++i){
						if(array[i] > key){
							array[j] = array[i];
							break;
						}
					}
				}
			}

			alert(array);
			alert("i="+i+",j="+j+",stepi="+stepi+",stepj="+stepj);
			
			// 如果第一个取出的 key 是最小的数
			if(stepi == i){
				Sort(++i, stepj);
				return ;
			}
			
			// 最后一个空位留给 key
			array[i] = key;
			
			// 递归
			Sort(stepi, i);
			Sort(j, stepj);
		}
		
		Sort(i, j);
		
		return array;
	}


</script>


</head>




<body>
	<div>快速排序</div>
</body>
</html>

 

posted @ 2016-02-03 12:18  tonglin0325  阅读(147)  评论(0)  编辑  收藏  举报