1、冒泡排序

function bubbleSort(arr) {

    var len = arr.length;

    for (var i = 0; i < len - 1; i++) {

        for (var j = 0; j < len - 1 - i; j++) {

            if (arr[j] > arr[j+1]) {       // 相邻元素两两对比

                var temp = arr[j+1];       // 元素交换

                arr[j+1] = arr[j];

                arr[j] = temp;

            }

        }

    }

    return arr;

}

2、选择排序

function selectionSort(arr) {

    var len = arr.length;

    var minIndex, temp;

    for (var i = 0; i < len - 1; i++) {

        minIndex = i;

        for (var j = i + 1; j < len; j++) {

            if (arr[j] < arr[minIndex]) {    // 寻找最小的数

                minIndex = j;                // 将最小数的索引保存

            }

        }

        temp = arr[i];

        arr[i] = arr[minIndex];

        arr[minIndex] = temp;

    }

    return arr;

} 

3、插入排序

function insertionSort(arr) {

    var len = arr.length;

    var preIndex, current;

    for (var i = 1; i < len; i++) {

        preIndex = i - 1;

        current = arr[i];

        while (preIndex >= 0 && arr[preIndex] > current) {

            arr[preIndex + 1] = arr[preIndex];

            preIndex--;

        }

        arr[preIndex + 1] = current;

    }

    return arr;

}

4、希尔排序

 function shellSort(arr) {

    var len = arr.length,

        temp,

        gap = 1;

    while (gap < len / 3) {         // 动态定义间隔序列

        gap = gap * 3 + 1;

    }

    for (gap; gap > 0; gap = Math.floor(gap / 3)) {

        for (var i = gap; i < len; i++) {

            temp = arr[i];

            for (var j = i-gap; j > 0 && arr[j]> temp; j-=gap) {

                arr[j + gap] = arr[j];

            }

            arr[j + gap] = temp;

        }

    }

    return arr;

}