Javascript经典算法学习1：产生随机数组的辅助类

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：

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;
}