js解析json格式

 function save(){
    			var value2 = {
			    "china":[
			        {"name":"hangzhou", "item":"1"},
			        {"name":"shanghai", "item":"2"},
			        {"name":"sichuan", "item":"3"}
			    ],
			    "America":[
			        {"name":"aa", "item":"12"},
			        {"name":"bb", "item":"2"}
			    ],
			    "Spain":[
			        {"name":"cc", "item":"1"},
			        {"name":"dd", "item":"23"},
			        {"name":"ee", "item":"3"}
			    ]
			}; 			

			for (var countryObj in value2)
			{
			    document.write(countryObj + ":<br />")
			    for (var cityObj in value2[countryObj])
			    {
			        //可以用document.write("-----" + value2[countryObj][cityObj].item + "<br />");
			        document.write(cityObj + " ++++++ " + value2[countryObj][cityObj]["name"] + "<br />" );
			    }
			}
    	}