辅助类
在几个经典排序算法学习部分,为方便统一测试不同算法,新建了一个辅助类,主要功能为:产生指定长度的随机数组,提供打印输出数组,交换两个元素等功能,代码如下:
function ArraySortUtility(numOfElements) {
this.dataArr = [];
this.pos = 0;
this.numOfElements = numOfElements;
this.insert = insert;
this.toString = toString;
this.clear = clear;
this.setData = setData;
this.swap = swap;
for (var i = 0; i < numOfElements.length; i++) {
this.dataArr[i] = i;
}
}ArraySortUtility.prototype={
constructor:ArraySortUtility,
bubbleSort: bubbleSort,
//下面添加新的方法
}
几个重要方法的实现如下:
setData 方法使用 Math.random()方法产生随机数,填充数组,关于随机数产生 具体请见 Javascript 随机数函数 学习之一:产生服从均匀分布随机数
function setData() {
for (var i = 0; i < this.numOfElements; i++) {
this.dataArr[i] = Math.floor(Math.random() * (this.numOfElements + 1));
}
}
其它几个函数实现如下:
function clear() {
for (var i = 0; i < this.dataArr.length; i++) {
this.dataArr[i] = 0;
}
}function insert(element) {
this.dataArr[this.pos++] = element;
}function toString() {
var restr = "";
for (var i = 0; i < this.dataArr.length; i++) {
restr += this.dataArr[i] + " ";
if (i > 0 & i % 10 == 0) {
restr += "\n";
}
}
return restr;
}function swap(arr, index1, index2) {
var temp = arr[index1];
arr[index1] = arr[index2];
arr[index2] = temp;
}