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总结几个jsvaScript 数组排序方法

2018-03-01 15:13 1051 查看
【1】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;
}【2】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;
}【3】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("-----------------------");
}【4】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;
}【5】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
4000
(right.length > 0) {
a = a.concat(right);
}
console.log(a);
console.log("-----------------------------");
return a;
}
【6】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)));
}
}
【7】插入排序
function insertSort(arr){
    for(var i =1,j;i<arr.lenght;i++){
        j=i;
        v=arr[j];
        while(arr[j-1]>v){
            arr[j] = arr[j-1];
            j--;
            if(j == 0){
            break;
            }
        }
        arr[j]=v;
    }
    return arr;
}
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