js中生成map對象的方法

 生成map對象的方法或許會有很多，在本文將為大家詳細介紹下使用js是如何做到的，感興趣的朋友不要錯過

代碼如下: var Map = function(){  this._entrys = new Array();    this.put = function(key, value){  if (key == null || key == undefined) {  return;  }  var index = this._getIndex(key);  if (index == -1) {  var entry = new Object();  entry.key = key;  entry.value = value;  this._entrys[this._entrys.length] = entry;  }else{  this._entrys[index].value = value;  }  };  this.get = function(key){  var index = this._getIndex(key);  return (index != -1) ? this._entrys[index].value : null;  };  this.remove = function(key){  var index = this._getIndex(key);  if (index != -1) {  this._entrys.splice(index, 1);  }  };  this.clear = function(){  this._entrys.length = 0;;  };  this.contains = function(key){  var index = this._getIndex(key);  return (index != -1) ? true : false;  };  this.getCount = function(){  return this._entrys.length;  };  this.getEntrys = function(){  return this._entrys;  };  this._getIndex = function(key){  if (key == null || key == undefined) {  return -1;  }  var _length = this._entrys.length;  for (var i = 0; i < _length; i++) {  var entry = this._entrys[i];  if (entry == null || entry == undefined) {  continue;  }  if (entry.key === key) {//equal  return i;  }  }  return -1;  };  this._toString = function(){  var string = "";  for (var i = 0; i < this.getEntrys().length; i++) {  string += this.getEntrys()[i].key+"::"+this.getEntrys()[i].value;  if(i!=this.getEntrys().length-1){  string += ";";  }  }  return string;  };  };