js兑现key,value

var hashMap = {};
	
	hashMap['key1'] = 'value1';
	hashMap['key2'] = 'value2';
	hashMap['key3'] = 'value3';
	hashMap['key4'] = 'value4';
	hashMap['key5'] = 'value5';
	hashMap['key6'] = 'value6';
	
	if( 'key2' in hashMap)
	{
		alert('existance');
	}
	
	for(value in hashMap)
	{
		alert(value);
	}

var hashMap = {   
    Set : function(key,value){this[key] = value},   
    Get : function(key){return this[key]},   
    Contains : function(key){return this.Get(key) == null?false:true},   
    Remove : function(key){delete this[key]}   
}