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js 数组排序和算法排序

发布:2018/11/1 23:58:11作者:管理员 来源:本站 浏览次数:1304

1.算法排序

a.插入排序

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var arr = [23,34,3,4,23,44,333,444];

var arrShow = (function insertionSort(array){
if(Object.prototype.toString.call(array).slice(8,-1) ==='Array'){

for (var i = 1; i < array.length; i++) {
var key = array[i];
var j = i - 1;
while (j >= 0 && array[j] > key) {
array[j + 1] = array[j];
j--;
}
array[j + 1] = key;
}
return array;
}else{

return 'array is not an Array!';
}
})(arr);

console.log(arrShow);//[3, 4, 23, 23, 34, 44, 333, 444]

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b.二分插入排序

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function binaryInsertionSort(array) { if (Object.prototype.toString.call(array).slice(8, -1) === 'Array') { for (var i = 1; i < array.length; i++) { var key = array[i], left = 0, right = i - 1; while (left <= right) { var middle = parseInt((left + right) / 2); if (key < array[middle]) {
right = middle - 1;
} else {
left = middle + 1;
}
} for (var j = i - 1; j >= left; j--) {
array[j + 1] = array[j];
}
array[left] = key;
} return array;
} else { return 'array is not an Array!';
}
}
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c.选择排序

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function selectionSort(array) { if (Object.prototype.toString.call(array).slice(8, -1) === 'Array') { var len = array.length, temp; for (var i = 0; i < len - 1; i++) { var min = array[i]; for (var j = i + 1; j < len; j++) { if (array[j] < min) {
temp = min;
min = array[j];
array[j] = temp;
}
}
array[i] = min;
} return array;
} else { return 'array is not an Array!';
}
}
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d、冒泡排序

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function bubbleSort(array) { if (Object.prototype.toString.call(array).slice(8, -1) === 'Array') { var len = array.length, temp; for (var i = 0; i < len - 1; i++) { for (var j = len - 1; j >= i; j--) { if (array[j] < array[j - 1]) {
temp = array[j];
array[j] = array[j - 1];
array[j - 1] = temp;
}
}
} return array;
} else { return 'array is not an Array!';
}
}
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e、快速排序

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//方法一 function quickSort(array, left, right) { if (Object.prototype.toString.call(array).slice(8, -1) === 'Array' && typeof left === 'number' && typeof right === 'number') { if (left < right) { var x = array[right], i = left - 1, temp; for (var j = left; j <= right; j++) { if (array[j] <= x) {
i++;
temp = array[i];
array[i] = array[j];
array[j] = temp;
}
}
quickSort(array, left, i - 1);
quickSort(array, i + 1, right);
};
} else { return 'array is not an Array or left or right is not a number!';
}
} var aaa = [3, 5, 2, 9, 1];
quickSort(aaa, 0, aaa.length - 1);
console.log(aaa); //方法二 var quickSort = function(arr) { if (arr.length <= 1) { return arr; } var pivotIndex = Math.floor(arr.length / 2); var pivot = arr.splice(pivotIndex, 1)[0]; var left = []; var right = []; for (var i = 0; i < arr.length; i++){ if (arr[i] < pivot) {
      left.push(arr[i]);
    } else {
      right.push(arr[i]);
    }
  } return quickSort(left).concat([pivot], quickSort(right));
};
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f、堆排序

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/*方法说明:堆排序
@param array 待排序数组*/ function heapSort(array) { if (Object.prototype.toString.call(array).slice(8, -1) === 'Array') { //建堆 var heapSize = array.length, temp; for (var i = Math.floor(heapSize / 2); i >= 0; i--) {
heapify(array, i, heapSize);
} //堆排序 for (var j = heapSize - 1; j >= 1; j--) {
temp = array[0];
array[0] = array[j];
array[j] = temp;
heapify(array, 0, --heapSize);
}
} else { return 'array is not an Array!';
}
} /*方法说明:维护堆的性质
@param arr 数组
@param x 数组下标
@param len 堆大小*/ function heapify(arr, x, len) { if (Object.prototype.toString.call(arr).slice(8, -1) === 'Array' && typeof x === 'number') { var l = 2 * x, r = 2 * x + 1, largest = x, temp; if (l < len && arr[l] > arr[largest]) {
largest = l;
} if (r < len && arr[r] > arr[largest]) {
largest = r;
} if (largest != x) {
temp = arr[x];
arr[x] = arr[largest];
arr[largest] = temp;
heapify(arr, largest, len);
}
} else { return 'arr is not an Array or x is not a number!';
}
}
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h、归并排序

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function mergeSort(array, p, r) { if (p < r) { var q = Math.floor((p + r) / 2);
mergeSort(array, p, q);
mergeSort(array, q + 1, r);
merge(array, p, q, r);
}
}
function merge(array, p, q, r) { var n1 = q - p + 1, n2 = r - q, left = [], right = [], m = n = 0; for (var i = 0; i < n1; i++) {
left[i] = array[p + i];
} for (var j = 0; j < n2; j++) {
right[j] = array[q + 1 + j];
}
left[n1] = right[n2] = Number.MAX_VALUE; for (var k = p; k <= r; k++) { if (left[m] <= right[n]) {
array[k] = left[m];
m++;
} else {
array[k] = right[n];
n++;
}
}
}
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g、桶排序

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/*方法说明:桶排序
@param array 数组
@param num 桶的数量*/ function bucketSort(array, num) { if (array.length <= 1) { return array;
} var len = array.length, buckets = [], result = [], min = max = array[0], regex = '/^[1-9]+[0-9]*$/', space, n = 0;
num = num || ((num > 1 && regex.test(num)) ? num : 10); for (var i = 1; i < len; i++) {
min = min <= array[i] ? min : array[i];
max = max >= array[i] ? max : array[i];
}
space = (max - min + 1) / num; for (var j = 0; j < len; j++) { var index = Math.floor((array[j] - min) / space); if (buckets[index]) { // 非空桶,插入排序 var k = buckets[index].length - 1; while (k >= 0 && buckets[index][k] > array[j]) {
buckets[index][k + 1] = buckets[index][k];
k--;
}
buckets[index][k + 1] = array[j];
} else { //空桶,初始化 buckets[index] = [];
buckets[index].push(array[j]);
}
} while (n < num) {
result = result.concat(buckets[n]);
n++;
} return result;
}
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i、计数排序

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function countingSort(array) { var len = array.length, B = [], C = [], min = max = array[0]; for (var i = 0; i < len; i++) {
min = min <= array[i] ? min : array[i];
max = max >= array[i] ? max : array[i];
C[array[i]] = C[array[i]] ? C[array[i]] + 1 : 1;
} for (var j = min; j < max; j++) {
C[j + 1] = (C[j + 1] || 0) + (C[j] || 0);
} for (var k = len - 1; k >=0; k--) {
B[C[array[k]] - 1] = array[k];
C[array[k]]--;
} return B;
}
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j、js自带的函数sort

arr.sort(function(a,b){

return a-b;

})

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<script> var arr = [23,34,3,4,23,44,333,444];
        arr.sort(function(a,b){ return a-b;
        })
    console.log(arr); </script>
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