1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312">
3 <head>
4 <title> 常见排序算法 之 JavaScript版 </title>
5 <meta http-equiv="content-type" content="text/html; charset=gb2312" />
6 <meta name="keywords" content="排序,算法,JavaScript排序" />
7 <meta name="description" content="用JavaScript实现的常见排序算法:冒泡排序,选择排序,插入排序,谢尔排序,快速排序(递归),快速排序(堆栈),归并排序,堆排序" />
8 <script type="text/javascript">
9 Array.prototype.swap = function(i, j)
10 {
11 var temp = this[i];
12 this[i] = this[j];
13 this[j] = temp;
14 }
15 Array.prototype.bubbleSort = function()
16 {
17 for (var i = this.length - 1; i > 0; --i)
18 {
19 for (var j = 0; j < i; ++j)
20 {
21 if (this[j] > this[j + 1]) this.swap(j, j + 1);
22 }
23 }
24 }
25 Array.prototype.selectionSort = function()
26 {
27 for (var i = 0; i < this.length; ++i)
28 {
29 var index = i;
30 for (var j = i + 1; j < this.length; ++j)
31 {
32 if (this[j] < this[index]) index = j;
33 }
34 this.swap(i, index);
35 }
36 }
37 Array.prototype.insertionSort = function()
38 {
39 for (var i = 1; i < this.length; ++i)
40 {
41 var j = i, value = this[i];
42 while (j > 0 && this[j - 1] > value)
43 {
44 this[j] = this[j - 1];
45 --j;
46 }
47 this[j] = value;
48 }
49 }
50 Array.prototype.shellSort = function()
51 {
52 for (var step = this.length >> 1; step > 0; step >>= 1)
53 {
54 for (var i = 0; i < step; ++i)
55 {
56 for (var j = i + step; j < this.length; j += step)
57 {
58 var k = j, value = this[j];
59 while (k >= step && this[k - step] > value)
60 {
61 this[k] = this[k - step];
62 k -= step;
63 }
64 this[k] = value;
65 }
66 }
67 }
68 }
69 Array.prototype.quickSort = function(s, e)
70 {
71 if (s == null) s = 0;
72 if (e == null) e = this.length - 1;
73 if (s >= e) return;
74 this.swap((s + e) >> 1, e);
75 var index = s - 1;
76 for (var i = s; i <= e; ++i)
77 {
78 if (this[i] <= this[e]) this.swap(i, ++index);
79 }
80 this.quickSort(s, index - 1);
81 this.quickSort(index + 1, e);
82 }
83 Array.prototype.stackQuickSort = function()
84 {
85 var stack = [0, this.length - 1];
86 while (stack.length > 0)
87 {
88 var e = stack.pop(), s = stack.pop();
89 if (s >= e) continue;
90 this.swap((s + e) >> 1, e);
91 var index = s - 1;
92 for (var i = s; i <= e; ++i)
93 {
94 if (this[i] <= this[e]) this.swap(i, ++index);
95 }
96 stack.push(s, index - 1, index + 1, e);
97 }
98 }
99 Array.prototype.mergeSort = function(s, e, b)
100 {
101 if (s == null) s = 0;
102 if (e == null) e = this.length - 1;
103 if (b == null) b = new Array(this.length);
104 if (s >= e) return;
105 var m = (s + e) >> 1;
106 this.mergeSort(s, m, b);
107 this.mergeSort(m + 1, e, b);
108 for (var i = s, j = s, k = m + 1; i <= e; ++i)
109 {
110 b[i] = this[(k > e || j <= m && this[j] < this[k]) ? j++ : k++];
111 }
112 for (var i = s; i <= e; ++i) this[i] = b[i];
113 }
114 Array.prototype.heapSort = function()
115 {
116 for (var i = 1; i < this.length; ++i)
117 {
118 for (var j = i, k = (j - 1) >> 1; k >= 0; j = k, k = (k - 1) >> 1)
119 {
120 if (this[k] >= this[j]) break;
121 this.swap(j, k);
122 }
123 }
124 for (var i = this.length - 1; i > 0; --i)
125 {
126 this.swap(0, i);
127 for (var j = 0, k = (j + 1) << 1; k <= i; j = k, k = (k + 1) << 1)
128 {
129 if (k == i || this[k] < this[k - 1]) --k;
130 if (this[k] <= this[j]) break;
131 this.swap(j, k);
132 }
133 }
134 }
135 function generate()
136 {
137 var max = parseInt(txtMax.value), count = parseInt(txtCount.value);
138 if (isNaN(max) || isNaN(count))
139 {
140 alert("个数和最大值必须是一个整数");
141 return;
142 }
143 var array = [];
144 for (var i = 0; i < count; ++i) array.push(Math.round(Math.random() * max));
145 txtInput.value = array.join("\n");
146 txtOutput.value = "";
147 }
148 function demo(type)
149 {
150 var array = txtInput.value == "" ? [] : txtInput.value.replace().split("\n");
151 for (var i = 0; i < array.length; ++i) array[i] = parseInt(array[i]);
152 var t1 = new Date();
153 eval("array." + type + "Sort()");
154 var t2 = new Date();
155 lblTime.innerText = t2.valueOf() - t1.valueOf();
156 txtOutput.value = array.join("\n");
157 }
158
159 </script>
160 </head>
161 <body onload="generate();">
162 <table style="font-size:12px;">
163 <tr>
164 <td align="right">
165 <textarea id="txtInput" style="width:120px;height:500px;" readonly></textarea>
166 </td>
167 <td width="150" align="center">
168 随机数个数<input id="txtCount" value="500" style="width:50px" /><br /><br />
169 最大随机数<input id="txtMax" value="1000" style="width:50px" /><br /><br />
170 <button onclick="generate()">重新生成</button><br /><br /><br /><br />
171 耗时(毫秒)：<label id="lblTime"></label><br /><br /><br /><br />
172 <button onclick="demo('bubble');">冒泡排序</button><br /><br />
173 <button onclick="demo('selection');">选择排序</button><br /><br />
174 <button onclick="demo('insertion');">插入排序</button><br /><br />
175 <button onclick="demo('shell');">谢尔排序</button><br /><br />
176 <button onclick="demo('quick');">快速排序(递归)</button><br /><br />
177 <button onclick="demo('stackQuick');">快速排序(堆栈)</button><br /><br />
178 <button onclick="demo('merge');">归并排序</button><br /><br />
179 <button onclick="demo('heap');">堆排序</button><br /><br />
180 </td>
181 <td align="left">
182 <textarea id="txtOutput" style="width:120px;height:500px;" readonly></textarea>
183 </td>
184 </tr>
185 </table>
186 </body>
187 </html>
