json的结构与遍历方法实例分析

var jsongood =
{"goods":[{"parentId":"null","productId":1,"name":"商品","amount":"null"},{"parentId":1,"productId":11,"name":"水果","amount":"null"}]};

for(var i = 0;i < jsongood.goods.length; i ++){
alert(jsongood.goods[i].amount);
}

var jsongood =
{"parentId":"null","productId":1,"name":"商品","amount":"null"}

function getJsonLength(jsonobj){
    var length = 0;
    for(var i in jsonobj){
      length ++;
    }
    return length;
}
getJsonLength(jsongood)