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Javascript中的常见排序算法_javascript技巧

May 16, 2016 pm 07:16 PM

排序演算法

具体代码及比较如下所示：

复制代码代码如下:

nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

常见排序算法之 JavaScript版

<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>

随机数个数

最大随机数

耗时(毫秒)：

快速排序, 插入排序, 希尔排序, 冒泡排序, quickSort, insertSort, shellSort, bubbleSort, javascript排序
说明
写这个主要是为了锻炼自己，并无实际意义。
每个浏览器测试得出的数据会不一样。比如我用chrome 测试一般快速排序都会最快，IE 则根据数组长度有可能希尔最快。
不要用太大数据去测试冒泡排序(浏览器崩溃了我不管)
如果有兴趣可以下载测试页面

个人理解

冒泡排序：最简单，也最慢，貌似长度小于7最优
插入排序：比冒泡快，比快速排序和希尔排序慢，较小数据有优势
快速排序：这是一个非常快的排序方式，V8的sort方法就使用快速排序和插入排序的结合
希尔排序：在非chrome下数组长度小于1000，希尔排序比快速更快
系统方法：在forfox下系统的这个方法非常快

算法源码

复制代码代码如下:

 
// ---------- 一些排序算法 
// js 利用sort进行排序 
systemSort:function(array){ 
return array.sort(function(a, b){ 
return a - b; 
}); 
}, 
// 冒泡排序 
bubbleSort:function(array){ 
var i = 0, len = array.length, 
j, d; 
for(; ifor(j=0; jif(array[i] d = array[j]; 
array[j] = array[i]; 
array[i] = d; 
} 
} 
} 
return array; 
}, 
// 快速排序 
quickSort:function(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){ 
// j 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; 
} 
} 
} 
} 
// 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; 
}, 
// 插入排序 
insertSort:function(array){ 
// http://baike.baidu.com/image/d57e99942da24e5dd21b7080 
// http://baike.baidu.com/view/396887.htm 
//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 = 1, j, step, key, 
len = array.length; 
for(; i step = j = i; 
key = array[j]; 
while(--j > -1){ 
if(array[j] > key){ 
array[j+1] = array[j]; 
}else{ 
break; 
} 
} 
array[j+1] = key; 
} 
return array; 
}, 
// 希尔排序 
//Jun.array.shellSort(Jun.array.df(10000)); 
shellSort:function(array){ 
// http://zh.wikipedia.org/zh/%E5%B8%8C%E5%B0%94%E6%8E%92%E5%BA%8F 
// var array = [13,14,94,33,82,25,59,94,65,23,45,27,73,25,39,10]; 
var stepArr = [1750, 701, 301, 132, 57, 23, 10, 4, 1]; // reverse() 在维基上看到这个最优的步长 较小数组 
//var stepArr = [1031612713, 217378076, 45806244, 9651787, 2034035, 428481, 90358, 19001, 4025, 836, 182, 34, 9, 1]//针对大数组的步长选择 
var i = 0; 
var stepArrLength = stepArr.length; 
var len = array.length; 
var len2 = parseInt(len/2); 
for(;i if(stepArr[i] > len2){ 
continue; 
} 
stepSort(stepArr[i]); 
} 
// 排序一个步长 
function stepSort(step){ 
//console.log(step) 使用的步长统计 
var i = 0, j = 0, f, tem, key; 
var stepLen = len%step > 0 ? parseInt(len/step) + 1 : len/step; 

for(;i for(j=1;/*j tem = f = step * j + i; 
key = array[f]; 
while((tem-=step) >= 0){// 依次向上查找 
if(array[tem] > key){ 
array[tem+step] = array[tem]; 
}else{ 
break; 
} 
} 
array[tem + step ] = key; 
} 
} 
} 
return array; 
} 