数据结构----字典

/*
* 算法——字典
* 字典是一种以键 - 值对形式存储数据的数据结构，Dictionay 类的基础是 Array 类。数组当对象用？？？
* add: 增加元素
* find：查找元素
* remove：删除元素
* */
function add(key,value) {
    this.dataStore[key] = value;
}
function find(key) {
    return this.dataStore[key]
}
function remove(key) {
    delete this.dataStore[key];
}
//sort 能够有序输出 叫有序字典
function showAll() {
    var keysArray = Object.keys(this.dataStore).sort();
    for (var i = 0 ; i < keysArray.length;i++) {
        console.log(keysArray[i] + "=====>" + this.dataStore[keysArray[i]]);
    }
}
function count() {
    var n = 0;
    for (var key in this.dataStore) {
        n++;
    }
    return n;
}
function clear() {
    for (var key in this.dataStore) {
        delete this.dataStore[key];
    }
}
function Dictionay() {
    this.dataStore = [];
    this.add = add;
    this.find = find;
    this.remove = remove;
    this.showAll = showAll;
    this.count = count;
    this.clear = clear;
}

var d = new Dictionay();

d.add("name","张三");
d.add("phone","15019222409");

d.showAll();
console.log(d.count())