Write a map with JavaScript

Tag: text NULL index false size script new get element

<script type= "Text/javascript" >functionMap () { This. elements =NewArray (); }    //get the number of map elementsMap.prototype.size =function() {        return  This. Elements.length;    }; //determine if the map is emptyMap.prototype.isEmpty =function() {        return( This. elements.length < 1);    }; //Delete all elements of mapMap.prototype.clear =function() {         This. elements =NewArray ();    }; //adding elements to a map (key, value)Map.prototype.put =function(_key, _value) {if( This. elements.length>0) {            varflag=true;  for(vari = 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});      };    }; //deletes the element of the specified key, returns true successfully, and fails to return falseMap.prototype.remove =function(_key) {varbln =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; }        returnbln;    }; //gets the element value of the specified key, and the failure returns nullMap.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;    }    }; //gets the element of the specified index (using Element.key,element.value to get the key and value), and fails to return nullMap.prototype.element =function(_index) {if(_index < 0 | | _index >= This. Elements.length) {            return NULL; }        return  This. Elements[_index];    }; //determine if the map contains an element of the specified keyMap.prototype.containsKey =function(_key) {varbln =false; Try {             for(i = 0; i < This. elements.length; i++) {                if( This. Elements[i].key = =_key) {bln=true; }            }        } Catch(e) {bln=false; }        returnbln;    }; //Determines whether the map contains an element of the specified valueMap.prototype.containsValue =function(_value) {varbln =false; Try {             for(i = 0; i < This. elements.length; i++) {                if( This. Elements[i].value = =_value) {bln=true; }            }        } Catch(e) {bln=false; }        returnbln;    }; //get an array of all the value in the map (array)Map.prototype.getValues =function() {        vararr = [];  for(i = 0; i < This. elements.length; i++) {Arr.push ( This. Elements[i].value); }        returnarr;    }; //gets an array of all keys in the map (array)Map.prototype.getKeys =function() {        vararr = [];  for(i = 0; i < This. elements.length; i++) {Arr.push ( This. Elements[i].key); }        returnarr; };</script>

Use JavaScript to imitate Java map function, group training work, record!

Write a map with JavaScript