//创建列表类
function ArrayList() {
this.array = []
ArrayList.prototype.insert = function (item) {
this.array.push(item)
}
ArrayList.prototype.toString = function () {
return this.array.join('-')
}
//交换两个数据的位置
ArrayList.prototype.swap = function (m, n) {
var temp = this.array[m]
this.array[m] = this.array[n]
this.array[n] = temp
}
ArrayList.prototype.median = function (left, right) {
//取出中间的位置
var center = Math.floor((left + right) / 2)
//判断大小进行交换
if (this.array[left] > this.array[center]) {
this.swap(left, center)
}
if (this.array[center] > this.array[right]) {
this.swap(center, right)
}
if (this.array[left] > this.array[right]) {
this.swap(left, right)
}
//将center换到right-1的位置
this.swap(center, right - 1)
return this.array[right - 1]
}
ArrayList.prototype.quick = function () {
this.quickSort(0, this.array.length - 1)
}
ArrayList.prototype.quickSort = function (left, right) {
//借宿条件
if (left >= right) return
//获取枢纽
var pivot = this.median(left, right)
var i = left
var j = right - 1
// 进行交换
while (true) {
while (this.array[++i] < pivot) {
}
while (this.array[--j] > pivot) {
}
if (i < j) {
this.swap(i, j)
} else {
break
}
}
this.swap(i, right - 1)
this.quickSort(left, i - 1)
this.quickSort(i + 1, right)
}
}
var list = new ArrayList()
list.insert(1)
list.insert(5)
list.insert(2)
list.insert(3)
list.insert(4)
list.quick()
alert(list)
