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Javascript中的常见排序算法

2007-03-27 00:00 941 查看

<!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" lang="gb2312">
<head>
<title> 常见排序算法之 JavaScript版 </title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="keywords" content="排序,算法,JavaScript排序" />
<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" />
<script type="text/javascript">
Array.prototype.swap = function(i, j)
{
var temp = this[i];
this[i] = this[j];
this[j] = temp;
}
Array.prototype.bubbleSort = function()
{
for (var i = this.length - 1; i > 0; --i)
{
for (var j = 0; j < i; ++j)
{
if (this[j] > this[j + 1]) this.swap(j, j + 1);
}
}
}
Array.prototype.selectionSort = function()
{
for (var i = 0; i < this.length; ++i)
{
var index = i;
for (var j = i + 1; j < this.length; ++j)
{
if (this[j] < this[index]) index = j;
}
this.swap(i, index);
}
}
Array.prototype.insertionSort = function()
{
for (var i = 1; i < this.length; ++i)
{
var j = i, value = this[i];
while (j > 0 && this[j - 1] > value)
{
this[j] = this[j - 1];
--j;
}
this[j] = value;
}
}
Array.prototype.shellSort = function()
{
for (var step = this.length >> 1; step > 0; step >>= 1)
{
for (var i = 0; i < step; ++i)
{
for (var j = i + step; j < this.length; j += step)
{
var k = j, value = this[j];
while (k >= step && this[k - step] > value)
{
this[k] = this[k - step];
k -= step;
}
this[k] = value;
}
}
}
}
Array.prototype.quickSort = function(s, e)
{
if (s == null) s = 0;
if (e == null) e = this.length - 1;
if (s >= e) return;
this.swap((s + e) >> 1, e);
var index = s - 1;
for (var i = s; i <= e; ++i)
{
if (this[i] <= this[e]) this.swap(i, ++index);
}
this.quickSort(s, index - 1);
this.quickSort(index + 1, e);
}
Array.prototype.stackQuickSort = function()
{
var stack = [0, this.length - 1];
while (stack.length > 0)
{
var e = stack.pop(), s = stack.pop();
if (s >= e) continue;
this.swap((s + e) >> 1, e);
var index = s - 1;
for (var i = s; i <= e; ++i)
{
if (this[i] <= this[e]) this.swap(i, ++index);
}
stack.push(s, index - 1, index + 1, e);
}
}
Array.prototype.mergeSort = function(s, e, b)
{
if (s == null) s = 0;
if (e == null) e = this.length - 1;
if (b == null) b = new Array(this.length);
if (s >= e) return;
var m = (s + e) >> 1;
this.mergeSort(s, m, b);
this.mergeSort(m + 1, e, b);
for (var i = s, j = s, k = m + 1; i <= e; ++i)
{
b[i] = this[(k > e || j <= m && this[j] < this[k]) ? j++ : k++];
}
for (var i = s; i <= e; ++i) this[i] = b[i];
}
Array.prototype.heapSort = function()
{
for (var i = 1; i < this.length; ++i)
{
for (var j = i, k = (j - 1) >> 1; k >= 0; j = k, k = (k - 1) >> 1)
{
if (this[k] >= this[j]) break;
this.swap(j, k);
}
}
for (var i = this.length - 1; i > 0; --i)
{
this.swap(0, i);
for (var j = 0, k = (j + 1) << 1; k <= i; j = k, k = (k + 1) << 1)
{
if (k == i || this[k] < this[k - 1]) --k;
if (this[k] <= this[j]) break;
this.swap(j, k);
}
}
}
function generate()
{
var max = parseInt(txtMax.value), count = parseInt(txtCount.value);
if (isNaN(max) || isNaN(count))
{
alert("个数和最大值必须是一个整数");
return;
}
var array = [];
for (var i = 0; i < count; ++i) array.push(Math.round(Math.random() * max));
txtInput.value = array.join("\n");
txtOutput.value = "";
}
function demo(type)
{
var array = txtInput.value == "" ? [] : txtInput.value.replace().split("\n");
for (var i = 0; i < array.length; ++i) array[i] = parseInt(array[i]);
var t1 = new Date();
eval("array." + type + "Sort()");
var t2 = new Date();
lblTime.innerText = t2.valueOf() - t1.valueOf();
txtOutput.value = array.join("\n");
}
</script>
</head>
<body onload="generate();">
<table style="font-size:12px;">
<tr>
<td align="right">
<textarea id="txtInput" style="width:120px;height:500px;" readonly></textarea>
</td>
<td width="150" align="center">
随机数个数<input id="txtCount" value="500" style="width:50px" /><br /><br />
最大随机数<input id="txtMax" value="1000" style="width:50px" /><br /><br />
<button onclick="generate()">重新生成</button><br /><br /><br /><br />
耗时(毫秒)：<label id="lblTime"></label><br /><br /><br /><br />
<button onclick="demo('bubble');">冒泡排序</button><br /><br />
<button onclick="demo('selection');">选择排序</button><br /><br />
<button onclick="demo('insertion');">插入排序</button><br /><br />
<button onclick="demo('shell');">谢尔排序</button><br /><br />
<button onclick="demo('quick');">快速排序(递归)</button><br /><br />
<button onclick="demo('stackQuick');">快速排序(堆栈)</button><br /><br />
<button onclick="demo('merge');">归并排序</button><br /><br />
<button onclick="demo('heap');">堆排序</button><br /><br />
</td>
<td align="left">
<textarea id="txtOutput" style="width:120px;height:500px;" readonly></textarea>
</td>
</tr>
</table>
</body>
</html>

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标签： 排序算法

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