js中生成map对象的方法

复制代码 代码如下:

  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;

  };

  };