javascript自定义HaskTable类

javascript自定义HaskTable类

/** * 自定义HaskTable类 * 调用方式:var hashTable = new Hashtable();hashTable.add(key,value); */var Hashtable = function(){this._hash = new Object();/**将key,value键值对存入hashTable*/this.add = function(key,value){if(typeof(key)!="undefined"){if(this.contains(key)==false){this._hash[key]=typeof(value)=="undefined"?null:value;return true;} else{return false;}} else{return false;}}/**从hashTable中移除指定key值的对象*/this.remove = function(key){delete this._hash[key];}/**统计hashTable中对象的个数*/this.count = function(){var i=0;for(var k in this._hash){i++;} return i;}/**根据键值获取指定的key值的对象*/this.items = function(key){return this._hash[key];}/**判断hashTable中是否已经包含指定键值*/this.contains = function(key){ return typeof(this._hash[key])!="undefined";}/**删除hashTable中所有对象*/this.clear = function(){for(var k in this._hash){delete this._hash[k];}}/**将HashTable转换成数组*/this.toArray = function(){var array = new Array();for(var k in this._hash){array.push(this._hash[k]);}return array;}/**将HashTable中的key值转换成数组*/this.keyToArray = function(){var array = new Array();for(var k in this._hash){array.push(k);}return array;}} ;