发布于 2017-02-17 16:44:07 | 17 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


下面小编就为大家带来一篇几种经典排序算法的JS实现方法。小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧

一.冒泡排序


function BubbleSort(array) {
  var length = array.length;
  for (var i = length - 1; i > 0; i--) { //用于缩小范围
    for (var j = 0; j < i; j++) { //在范围内进行冒泡,在此范围内最大的一个将冒到最后面
      if (array[j] > array[j+1]) { 
        var temp = array[j];
        array[j] = array[j+1];
        array[j+1] = temp;
      }
    }
    console.log(array);
    console.log("-----------------------------");
  }
  return array;
}


var arr = [10,9,8,7,7,6,5,11,3];
var result = BubbleSort(arr);
console.log(result); 
/*
[ 9, 8, 7, 7, 6, 5, 10, 3, 11 ]
-----------------------------
[ 8, 7, 7, 6, 5, 9, 3, 10, 11 ]
-----------------------------
[ 7, 7, 6, 5, 8, 3, 9, 10, 11 ]
-----------------------------
[ 7, 6, 5, 7, 3, 8, 9, 10, 11 ]
-----------------------------
[ 6, 5, 7, 3, 7, 8, 9, 10, 11 ]
-----------------------------
[ 5, 6, 3, 7, 7, 8, 9, 10, 11 ]
-----------------------------
[ 5, 3, 6, 7, 7, 8, 9, 10, 11 ]
-----------------------------
[ 3, 5, 6, 7, 7, 8, 9, 10, 11 ]
-----------------------------
[ 3, 5, 6, 7, 7, 8, 9, 10, 11 ]
*/

二.选择排序


function SelectionSort(array) {
  var length = array.length;
  for (var i = 0; i < length; i++) { //缩小选择的范围
    var min = array[i]; //假定范围内第一个为最小值
    var index = i; //记录最小值的下标
    for (var j = i + 1; j < length; j++) { //在范围内选取最小值
      if (array[j] < min) {
        min = array[j];
        index = j;
      }
    }
    if (index != i) { //把范围内最小值交换到范围内第一个
      var temp = array[i];
      array[i] = array[index];
      array[index] = temp;
    }
    console.log(array);
    console.log("---------------------");
  }
  return array;
}

var arr = [ 1, 10, 100, 90, 65, 5, 4, 10, 2, 4 ];
var result = SelectionSort(arr);
console.log(result);
/*
[ 1, 10, 100, 90, 65, 5, 4, 10, 2, 4 ]
---------------------
[ 1, 2, 100, 90, 65, 5, 4, 10, 10, 4 ]
---------------------
[ 1, 2, 4, 90, 65, 5, 100, 10, 10, 4 ]
---------------------
[ 1, 2, 4, 4, 65, 5, 100, 10, 10, 90 ]
---------------------
[ 1, 2, 4, 4, 5, 65, 100, 10, 10, 90 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 100, 65, 10, 90 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 10, 65, 100, 90 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 10, 65, 100, 90 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 10, 65, 90, 100 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 10, 65, 90, 100 ]
---------------------
[ 1, 2, 4, 4, 5, 10, 10, 65, 90, 100 ]
*/

三.插入排序


function InsertionSort(array) {
  var length = array.length;
  for (var i = 0; i < length - 1; i++) {
    //i代表已经排序好的序列最后一项下标
    var insert = array[i+1];
    var index = i + 1;//记录要被插入的下标
    for (var j = i; j >= 0; j--) {
      if (insert < array[j]) {
        //要插入的项比它小,往后移动
        array[j+1] = array[j];
        index = j;
      }
    }
    array[index] = insert;
    console.log(array);
    console.log("-----------------------");
  }
  return array;
}

var arr = [100,90,80,62,80,8,1,2,39];
var result = InsertionSort(arr);
console.log(result);
/*
[ 90, 100, 80, 62, 80, 8, 1, 2, 39 ]
-----------------------
[ 80, 90, 100, 62, 80, 8, 1, 2, 39 ]
-----------------------
[ 62, 80, 90, 100, 80, 8, 1, 2, 39 ]
-----------------------
[ 62, 80, 80, 90, 100, 8, 1, 2, 39 ]
-----------------------
[ 8, 62, 80, 80, 90, 100, 1, 2, 39 ]
-----------------------
[ 1, 8, 62, 80, 80, 90, 100, 2, 39 ]
-----------------------
[ 1, 2, 8, 62, 80, 80, 90, 100, 39 ]
-----------------------
[ 1, 2, 8, 39, 62, 80, 80, 90, 100 ]
-----------------------
[ 1, 2, 8, 39, 62, 80, 80, 90, 100 ]
*/

四.希尔排序


function ShellSort(array) {
  var length = array.length;
  var gap = Math.round(length / 2);
  while (gap > 0) {
    for (var i = gap; i < length; i++) {
      var insert = array[i];
      var index = i;
      for (var j = i; j >= 0; j-=gap) {
        if (insert < array[j]) {
          array[j+gap] = array[j];
          index = j;
        }
      }
      array[index] = insert;
    }
    console.log(array);
    console.log("-----------------------");
    gap = Math.round(gap/2 - 0.1);
  }
  return array;
}

var arr = [ 13, 14, 94, 33, 82, 25, 59, 94, 65, 23, 45, 27, 73, 25, 39, 10 ];
var result = ShellSort(arr);
console.log(result); 
/*
[ 13, 14, 45, 27, 73, 25, 39, 10, 65, 23, 94, 33, 82, 25, 59, 94 ]
-----------------------
[ 13, 14, 39, 10, 65, 23, 45, 27, 73, 25, 59, 33, 82, 25, 94, 94 ]
-----------------------
[ 13, 10, 39, 14, 45, 23, 59, 25, 65, 25, 73, 27, 82, 33, 94, 94 ]
-----------------------
[ 10, 13, 14, 23, 25, 25, 27, 33, 39, 45, 59, 65, 73, 82, 94, 94 ]
-----------------------
[ 10, 13, 14, 23, 25, 25, 27, 33, 39, 45, 59, 65, 73, 82, 94, 94 ]
*/

五.归并排序


function MergeSort(array) {
  var length = array.length;
  if (length <= 1) {
    return array;
  } else {
    var num = Math.ceil(length/2);
    var left = MergeSort(array.slice(0, num));
    var right = MergeSort(array.slice(num, length));
    return merge(left, right);
  }
}

function merge(left, right) {
  console.log(left);
  console.log(right);
  var a = new Array();
  while (left.length > 0 && right.length > 0) {
    if (left[0] <= right[0]) {
      var temp = left.shift();
      a.push(temp);
    } else {
      var temp = right.shift();
      a.push(temp);
    }
  }
  if (left.length > 0) {
    a = a.concat(left);
  }
  if (right.length > 0) {
    a = a.concat(right);
  }
  console.log(a);
  console.log("-----------------------------");
  return a;
}

var arr = [ 13, 14, 94, 33, 82, 25, 59, 94, 65, 23, 45, 27, 73, 25, 39, 10 ];
var result = MergeSort(arr);
console.log(result);
/*
[ 13 ]
[ 14 ]
[ 13, 14 ]
-----------------------------
[ 94 ]
[ 33 ]
[ 33, 94 ]
-----------------------------
[ 13, 14 ]
[ 33, 94 ]
[ 13, 14, 33, 94 ]
-----------------------------
[ 82 ]
[ 25 ]
[ 25, 82 ]
-----------------------------
[ 59 ]
[ 94 ]
[ 59, 94 ]
-----------------------------
[ 25, 82 ]
[ 59, 94 ]
[ 25, 59, 82, 94 ]
-----------------------------
[ 13, 14, 33, 94 ]
[ 25, 59, 82, 94 ]
[ 13, 14, 25, 33, 59, 82, 94, 94 ]
-----------------------------
[ 65 ]
[ 23 ]
[ 23, 65 ]
-----------------------------
[ 45 ]
[ 27 ]
[ 27, 45 ]
-----------------------------
[ 23, 65 ]
[ 27, 45 ]
[ 23, 27, 45, 65 ]
-----------------------------
[ 73 ]
[ 25 ]
[ 25, 73 ]
-----------------------------
[ 39 ]
[ 10 ]
[ 10, 39 ]
-----------------------------
[ 25, 73 ]
[ 10, 39 ]
[ 10, 25, 39, 73 ]
-----------------------------
[ 23, 27, 45, 65 ]
[ 10, 25, 39, 73 ]
[ 10, 23, 25, 27, 39, 45, 65, 73 ]
-----------------------------
[ 13, 14, 25, 33, 59, 82, 94, 94 ]
[ 10, 23, 25, 27, 39, 45, 65, 73 ]
[ 10, 13, 14, 23, 25, 25, 27, 33, 39, 45, 59, 65, 73, 82, 94, 94 ]
-----------------------------
[ 10, 13, 14, 23, 25, 25, 27, 33, 39, 45, 59, 65, 73, 82, 94, 94 ]
*/

六.快速排序


function QuickSort(array) {
  var length = array.length;
  if (length <= 1) {
    return array;
  } else {
    var smaller = [];
    var bigger = [];
    var base = [array[0]];
    for (var i = 1; i < length; i++) {
      if (array[i] <= base[0]) {
        smaller.push(array[i]);
      } else {
        bigger.push(array[i]);
      }
    }
    console.log(smaller.concat(base.concat(bigger)));
    console.log("-----------------------");
    return QuickSort(smaller).concat(base.concat(QuickSort(bigger)));
  }
}


var arr = [ 8, 10, 100, 90, 65, 5, 4, 10, 2, 4 ];
var result = QuickSort(arr);
console.log(result);
/*
[ 5, 4, 2, 4, 8, 10, 100, 90, 65, 10 ]
-----------------------
[ 4, 2, 4, 5 ]
-----------------------
[ 2, 4, 4 ]
-----------------------
[ 2, 4 ]
-----------------------
[ 10, 10, 100, 90, 65 ]
-----------------------
[ 90, 65, 100 ]
-----------------------
[ 65, 90 ]
-----------------------
[ 2, 4, 4, 5, 8, 10, 10, 65, 90, 100 ]
*/

以上这篇几种经典排序算法的JS实现方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持phperz。



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