標籤:text null index false size script new 擷取 element
<script type="text/javascript"> function Map() { this.elements = new Array(); } //擷取MAP元素個數 Map.prototype.size = function() { return this.elements.length; }; //判斷MAP是否為空白 Map.prototype.isEmpty = function() { return (this.elements.length < 1); }; //刪除MAP所有元素 Map.prototype.clear = function() { this.elements = new Array(); }; //向MAP中增加元素(key, value) Map.prototype.put = function(_key, _value) { if (this.elements.length>0) { var flag=true; for (var i = 0; i < this.elements.length; i++) { if (this.elements[i].key==_key) { this.elements[i].value=_value; flag=false; } }; if (flag) { this.elements.push({ key : _key, value : _value }); }; }else{ 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 Map.prototype.remove = 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; }; //擷取指定KEY的元素值VALUE,失敗返回NULL Map.prototype.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 null; } }; //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 Map.prototype.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 Map.prototype.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 Map.prototype.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; }; //擷取MAP中所有VALUE的數組(ARRAY) Map.prototype.getValues = function() { var arr = []; for (i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].value); } return arr; }; //擷取MAP中所有KEY的數組(ARRAY) Map.prototype.getKeys = function() { var arr = []; for (i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].key); } return arr; };</script>
用JavaScript仿java的map功能,小組培訓作業,記錄一下!
用JavaScript寫map