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

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 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();//3pbook.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：

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。