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JS字典Dictionary类定义与用法示例

本文实例讲述了JS字典Dictionary类定义与用法。分享给大家供大家参考,具体如下:

字典 Dictionary类

/*字典 Dictionary类*/
function Dictionary() {
  this.add = add;
  this.datastore = new Array();
  this.find = find;
  this.remove = remove;
  this.showAll = showAll;
  this.count = count;
  this.clear = clear;
}
function add(key, value) {
  this.datastore[key] = value;
}
function find(key) {
  return this.datastore[key];
}
function remove(key) {
  delete this.datastore[key];
}
function showAll() {
  var str = "";
  for(var key in this.datastore) {
    str += key + " -> " + this.datastore[key] + "; "
  }
  console.log(str);
}
function count() {
  /*var ss = Object.keys(this.datastore).length;
  console.log("ssss  "+ss);
  return Object.keys(this.datastore).length;*/
  /**/
  var n = 0;
  for(var key in Object.keys(this.datastore)) {
    ++n;
  }
  console.log(n);
  return n;
}
function clear() {
  for(var key in this.datastore) {
    delete this.datastore[key];
  }
}
var pbook = new Dictionary();
pbook.add("Mike", "723");
pbook.add("Jennifer", "987");
pbook.add("Jonathan", "666");
pbook.showAll();//Mike -> 723; Jennifer -> 987; Jonathan -> 666;
pbook.count();//3
pbook.remove("Jennifer");
//pbook.clear();
pbook.showAll();//Mike -> 723; Jonathan -> 666;
pbook.count();//2

这里使用在线HTML/CSS/JavaScript代码运行工具:http://tools.jb51.net/code/HtmlJsRun测试上述代码,可得如下运行结果:

JS字典Dictionary类定义与用法示例

更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript数据结构与算法技巧总结》、《JavaScript数学运算用法总结》、《JavaScript排序算法总结》、《JavaScript遍历算法与技巧总结》、《JavaScript查找算法技巧总结》及《JavaScript错误与调试技巧总结》

希望本文所述对大家JavaScript程序设计有所帮助。