//定义map function Map() { this.container = {};}//将key-value放入map中 Map.prototype.put = function(key, value) { try { if (key != null){ this.container[key] = value; } } catch (e) { return e; }};//根据key从map中取出对应的value Map.prototype.get = function(key,deft) { if(!this.containsKey(key)){ return deft; } try { return this.container[key]; } catch (e) { return e; }};//判断map中是否包含指定的key Map.prototype.containsKey = function(key) { try { for ( var p in this.container) { if (p == key) return true; } return false; } catch (e) { return e; }}//判断map中是否包含指定的value Map.prototype.containsValue = function(value) { try { for ( var p in this.container) { if (this.container[p] === value) return true; } return false; } catch (e) { return e; }};//删除map中指定的key Map.prototype.remove = function(key) { try { delete this.container[key]; } catch (e) { return e; }};//清空map Map.prototype.clear = function() { try { delete this.container; this.container = {}; } catch (e) { return e; }};//判断map是否为空 Map.prototype.isEmpty = function() { if (this.keySet().length == 0) return true; else return false;};//获取map的大小 Map.prototype.size = function() { return this.keySet().length;}//返回map中的key值数组 Map.prototype.keySet = function() { var keys = new Array(); for ( var p in this.container) { keys.push(p); } return keys;}//遍历MapMap.prototype.each = function(fun){ var keys = this.keySet(); for(var i = 0;i < keys.length;i++){ fun(keys[i],this.get(keys[i])); }}//返回map中的values值数组 Map.prototype.values = function() { var valuesArray = new Array(); var keys = this.keySet(); for (var i = 0; i < keys.length; i++) { valuesArray.push(this.container[keys[i]]); } return valuesArray;}//获取Map的最大值，参数为比较函数Map.prototype.max = function(compare){ var keys = this.keySet(); var maxKey = keys[0],maxValue = this.get(keys[0]); for(var i = 0;i < keys.length;i++){ if(compare(this.get(keys[i],maxValue))){ maxValue = this.get(keys[i]); maxKey = keys[i]; } } return [maxKey,maxValue];}//返回 map 中的 entrySet 对象Map.prototype.entrySet = function() { var array = new Array(); var keys = this.keySet(); for (var i = 0; i < keys.length; i++) { array.push(keys[i],this.container[keys[i]]); } return array;}
