|

升级   42% - 注册时间
- 2006-2-11
- 威望
- 75
- 阅读权限
- 20
- 积分
- 113
- 帖子
- 55
- 精华
- 1
- UID
- 46889
- 状态
- 当前离线
|
JS在这方面的效率比 C++、Java 还是要差很多地……
- <script>
- 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>
- <body onload=generate()>
- <table style="width:100%;height:100%;font-size:12px;font-family:宋体">
- <tr>
- <td align=right>
- <textarea id=txtInput readonly style="width:100px;height:100%"></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 readonly style="width:100px;height:100%"></textarea>
- </td>
- </tr>
- </table>
- </body>
复制代码运行代码另存代码 |
|