JavaScript中怎么使用JSON?

<script>	
    var  params = [];
    for(var i = 0; i < 3; i++){
        var param = [];
        param.push("one");
        param.push("two");
        param.push("three");
        params.push({"group":i,"param":param});
    }

    var json = JSON.stringify(params);
    alert(json);
</script>

// 输出结果是：[{"group":0,"param":["one","two","three"]},{"group":1,"param":["one","two","three"]},{"group":2,"param":["one","two","three"]}]

var object = {};
var params = [];
    
for(var i = 0; i < 3; i++){
	var obj = {};	
	obj[i] = "abc";
	params.push(obj);
	
}
object['name'] = 'jack';
object['age'] = 25;
object['data'] = params;
 
var json = JSON.stringify(object);

console.log(json);

//输出为：{"name":"jack","age":25,"data":[{"0":"abc"},{"1":"abc"},{"2":"abc"}]}

var text = '{ "sites" : [' +
  '{ "name":"Learn-anything" , "url":"www.learn-anything.cn" },' +
  '{ "name":"Google" , "url":"www.google.com" },' +
  '{ "name":"Taobao" , "url":"www.taobao.com" } ]}';

obj = JSON.parse(text);
console.log("obj", obj);