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js常用排序实现代码

发布于:2018-09-14 作者:admin
复制代码 代码如下: <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 > <tr> <td align=right> <textarea id=txtInput readonly ></textarea> </td> <td width=150 align=center> 随机数个数<input id=txtCount value=500 ><br><br> 最大随机数<input id=txtMax value=1000 ><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 ></textarea> </td> </tr> </table> </body>

本文源自: 环亚国际_环亚国际娱乐_环亚国际娱乐平台_新浪娱乐