javascript實現簡單的Map樣本介紹

來源:互聯網
上載者:User

 本文為大家介紹下使用javascript實現簡單的Map,可以對map進行擷取、判斷、刪除、增加等等,感興趣的朋友可以瞭解下

 代碼如下:/* * MAP對象,實現MAP功能 * * 介面: * size() 擷取MAP元素個數 * isEmpty() 判斷MAP是否為空白 * clear() 刪除MAP所有元素 * put(key, value) 向MAP中增加元素(key, value) * remove(key) 刪除指定KEY的元素,成功返回True,失敗返回False * get(key) 擷取指定KEY的元素值VALUE,失敗返回NULL * element(index) 擷取指定索引的元素(使用element.key,element.value擷取KEY和VALUE),失敗返回NULL * containsKey(key) 判斷MAP中是否含有指定KEY的元素 * containsValue(value) 判斷MAP中是否含有指定VALUE的元素 * values() 擷取MAP中所有VALUE的數組(ARRAY) * keys() 擷取MAP中所有KEY的數組(ARRAY) * * 例子: * var map = new Map(); * * map.put("key", "value"); * var val = map.get("key") * …… * */ function Map() { this.elements = new Array();  //擷取MAP元素個數 this.size = function() { return this.elements.length; };  //判斷MAP是否為空白 this.isEmpty = function() { return (this.elements.length < 1); };  //刪除MAP所有元素 this.clear = function() { this.elements = new Array(); };  //向MAP中增加元素(key, value) this.put = function(_key, _value) { this.elements.push( { key : _key, value : _value }); };  //刪除指定KEY的元素,成功返回True,失敗返回False this.removeByKey = function(_key) { var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].key == _key) { this.elements.splice(i, 1); return true; } } } catch (e) { bln = false; } return bln; };  //刪除指定VALUE的元素,成功返回True,失敗返回False this.removeByValue = function(_value) {//removeByValueAndKey var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].value == _value) { this.elements.splice(i, 1); return true; } } } catch (e) { bln = false; } return bln; };  //刪除指定VALUE的元素,成功返回True,失敗返回False this.removeByValueAndKey = function(_key,_value) { var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].value == _value && this.elements[i].key == _key) { this.elements.splice(i, 1); return true; } } } catch (e) { bln = false; } return bln; };  //擷取指定KEY的元素值VALUE,失敗返回NULL this.get = function(_key) { try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].key == _key) { return this.elements[i].value; } } } catch (e) { return false; } return false; };  //擷取指定索引的元素(使用element.key,element.value擷取KEY和VALUE),失敗返回NULL this.element = function(_index) { if (_index < 0 || _index >= this.elements.length) { return null; } return this.elements[_index]; };  //判斷MAP中是否含有指定KEY的元素 this.containsKey = function(_key) { var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].key == _key) { bln = true; } } } catch (e) { bln = false; } return bln; };  //判斷MAP中是否含有指定VALUE的元素 this.containsValue = function(_value) { var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].value == _value) { bln = true; } } } catch (e) { bln = false; } return bln; };  //判斷MAP中是否含有指定VALUE的元素 this.containsObj = function(_key,_value) { var bln = false; try { for (i = 0; i < this.elements.length; i++) { if (this.elements[i].value == _value && this.elements[i].key == _key) { bln = true; } } } catch (e) { bln = false; } return bln; };  //擷取MAP中所有VALUE的數組(ARRAY) this.values = function() { var arr = new Array(); for (i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].value); } return arr; };  //擷取MAP中所有VALUE的數組(ARRAY) this.valuesByKey = function(_key) { var arr = new Array(); for (i = 0; i < this.elements.length; i++) { if (this.elements[i].key == _key) { arr.push(this.elements[i].value); } } return arr; };  //擷取MAP中所有KEY的數組(ARRAY) this.keys = function() { var arr = new Array(); for (i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].key); } return arr; };  //擷取key通過value this.keysByValue = function(_value) { var arr = new Array(); for (i = 0; i < this.elements.length; i++) { if(_value == this.elements[i].value){ arr.push(this.elements[i].key); } } return arr; };  //擷取MAP中所有KEY的數組(ARRAY) this.keysRemoveDuplicate = function() { var arr = new Array(); for (i = 0; i < this.elements.length; i++) { var flag = true; for(var j=0;j<arr.length;j++){ if(arr[j] == this.elements[i].key){ flag = false; break; } } if(flag){ arr.push(this.elements[i].key); } } return arr; }; }  

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