Example code for implementing a map in JavaScript _javascript tips

No nonsense, directly affixed to the code.

Code One:

var map=new map ();
Map.put ("A", "a"); Map.put ("B", "B"); Map.put ("C", "C")
; Map.get ("a"); Back: A
map.entryset ()//Return Entity[{key,value},{key,value}]
Map.containskey (' Kevin ')//return: false

function Map () {This.keys = new Array (); 
  This.data = new Object (); /** * Put a key value pair * @param {String} key * @param {Object} value */this.put = function (key, value) {I 
      F (this.data[key] = = null) {This.keys.push (key); 
    This.data[key] = value; 
    }else{This.data[key]=this.data[key]; 
  return true; 
  };  /** * Gets the value of a key * @param {String} key * @return {Object} value */this.get = function (key) {return 
  This.data[key]; 
  }; /** * Delete a key value pair * @param {String} key */this.remove = function (key) {for (Var i=0;i<this.keys.length 
        ; i++) {if (Key===this.keys[i]) {var del_keys= this.keys.splice (i,1); 
        For (k in Del_keys) {this.data[k] = null; 
      return true; 
  return false; 
  }; 
   /** * Traverse map, perform handler function * @param {function} callback function functions (Key,value,index) {.} */This.each = function (fn) {if typeof fn!= ' function ') {return; 
    var len = this.keys.length; 
      for (Var i=0;i<len;i++) {var k = this.keys[i]; 
    FN (k,this.data[k],i); 
  } 
  }; /** * Gets an array of key values * @return Entity[{key,value},{key,value}]/this.entryset = function () {var len = this. 
    Keys.length; 
    var entrys = new Array (len); for (var i = 0; i < len; i++) {Entrys[i] = {Key:this.keys[i], value:this.data[this.keys[ 
    I]]}; 
  return entrys; 
  }; 
  /** * To determine whether the map is empty/this.isempty = function () {return this.keys.length = 0; 
  }; 
  /** * Gets the key value pair quantity/this.size = function () {return this.keys.length; 
  }; 
      This.containskey=function (key) {return This.keys.filter (function (v) {if (V===key) {return key; 
  }) .length>0; 
  }; 
    /** * Rewrite toString */this.tostring = function () {var s = "{"; 
   for (Var i=0;i<this.keys.length;i++) {   var k = this.keys[i]; 
      s + + "=" +this.data[k]; 
    if (this.keys.length>i+1) {s+= ', '}} s+= '} '; 
  return s; 
  }; 
    /** * Parse String to map * {a=a,b=b,c=b,}/* * This.parserstringandaddmap=function (str) {var count=0; 
      if (str && str.length>0) {Str=str.trim (); 
      var startindex=str.indexof ("{"), Endindex=str.lastindexof ("}"); 
        if (startindex!==-1 && endindex!==-1) {str=str.substring (startindex+1,endindex); 
        var arrs= str.split (","); 
          for (Var i=0;i<arrs.length;i++) {var kv=arrs[i].trim (); 
            if (kv.length>0 && kv.indexof ("=")!==-1) {var kv_arr=kv.split ("="); 
              if (kv_arr.length==2) {if (This.put (Kv_arr[0].trim (), Kv_arr[1].trim ())) {count++; 
              }else{console.error (' error:kv: ' +kv); 
       }}}}else{ Console.log ("Data error:" +STR); 
    }}else{Console.log (' data is not empty '); 
  return count; 
};  }

code two:

Array.prototype.remove = function (s) {for (var i = 0; i < this.length; i++) {if (s = = This[i]) this.spli
  Ce (i, 1);
 }/** * Simple map * * * var m = new Map ();
 * M.put (' key ', ' value ');
 * ... * var s = "";
 * M.each (function (key,value,index) {* s + + index+ ":" + key+ "=" +value+ "\ n";
 * });
 * Alert (s);
  * * @author DeWitt * @date 2008-05-24/function Map () {/** The array of keys (traversal used)/This.keys = new Array ();
  /** Store Data * * This.data = new Object (); /** * Put a key value pair * @param {String} key * @param {Object} value */this.put = function (key, value) {if (this
    . data[key] = = null) {This.keys.push (key);
  } This.data[key] = value;
  }; /** * Gets the value of a key * @param {String} key * @return {Object} value */this.get = function (key) {return this.
  Data[key];
  };
    /** * Delete a key value pair * @param {String} key */this.remove = function (key) {this.keys.remove (key);
  This.data[key] = null;
  }; /** * Traverse map to perform processingFunctions * * @param {function} callback function functions (Key,value,index) {.}
    */This.each = function (fn) {if (typeof fn!= ' function ') {return;
    var len = this.keys.length;
      for (Var i=0;i<len;i++) {var k = this.keys[i];
    FN (k,this.data[k],i);
  }
  }; /** * Gets the array of key values (Java-like EntrySet ()) * @return The array of key-value objects {Key,value} */This.entrys = function () {var len = this.k
    Eys.length;
    var entrys = new Array (len);
    for (var i = 0; i < len; i++) {Entrys[i] = {Key:this.keys[i], value:this.data[i]};
  return entrys;
  };
  /** * To determine whether the map is empty/this.isempty = function () {return this.keys.length = 0;
  };
  /** * Gets the key value pair quantity/this.size = function () {return this.keys.length;
  };
    /** * Rewrite toString */this.tostring = function () {var s = "{";
      for (Var i=0;i<this.keys.length;i++,s+= ', ') {var k = this.keys[i];
    s + + "=" +this.data[k];
    } s+= "}"; RetUrn S;
}; }

function TestMap () {
  var m = new Map ();
  M.put (' Key1 ', ' comtop ');
  M.put (' Key2 ', ' Southern Grid ');
  M.put (' Key3 ', ' jingxin Garden ');
  Alert ("Init:" +m);
  M.put (' Key1 ', ' Kang Topu ');
  Alert ("Set Key1:" +m);
  M.remove ("Key2");
  Alert ("Remove Key2:" +m);
  var s = "";
  M.each (function (key,value,index) {
    s + + index+ ":" + key+ "=" +value+ "\ n";
  });
  alert (s);
}

The above content through two pieces of code for everyone to share the JavaScript implementation map, I hope you like.