JavaScript怎么获取JSON数据呢，求解答！小弟在线等······急！！！！！

Question

[{
        "20170915": {
            "131082": {
                "REG_TOTAL_NUM": "173",
                "ACC_TOTAL_NUM": "173",
               
            },
            "131028": {
                "REG_TOTAL_NUM": "2",
                "ACC_TOTAL_NUM": "2",
               
            },
            "131022": {
                "REG_TOTAL_NUM": "260",
                "ACC_TOTAL_NUM": "260",
               
            },
            "131024": {
                "REG_TOTAL_NUM": "31",
                "ACC_TOTAL_NUM": "31",
               
            },
            "131025": {
                "REG_TOTAL_NUM": "4",
                "ACC_TOTAL_NUM": "4",
                
            },
            "131002": {
                "REG_TOTAL_NUM": "378",
                "ACC_TOTAL_NUM": "378",
               
            },
            "131003": {
                "REG_TOTAL_NUM": "346",
                "ACC_TOTAL_NUM": "346",
               
            },
            "131026": {
                "REG_TOTAL_NUM": "1",
                "ACC_TOTAL_NUM": "1",
             
            },
            "131023": {
                "REG_TOTAL_NUM": "1362",
                "ACC_TOTAL_NUM": "1331",
               
            },
            "131081": {
                "REG_TOTAL_NUM": "129",
                "ACC_TOTAL_NUM": "113",
               
            }
        }
},
    {
        "20170916": {
            "131082": {
                "REG_TOTAL_NUM": "252",
                "ACC_TOTAL_NUM": "252",
               
            },
            "131028": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
                
            },
            "131022": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
               
            },
            "131024": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
                
            },
            "131025": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
              
            },
            "131002": {
                "REG_TOTAL_NUM": "538",
                "ACC_TOTAL_NUM": "538",
               
            },
            "131003": {
                "REG_TOTAL_NUM": "332",
                "ACC_TOTAL_NUM": "332",
              
            },
            "131026": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
              
            },
            "131023": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
               
            },
            "131081": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0",
              
            }
        }
}]alert(this["20170915"]["131003"].REG_TOTAL_NUM)
通过jquery遍历可以获取到值：346；
可是 alert(this["20170916"]["131003"].REG_TOTAL_NUM)
怎么就获取不到值呢？
请问是什么原因，应该怎么获取呢，麻烦知道的情给解答一下，在线等！！

Answer 1

1. jqueryajax请求  $.ajax({
         type: "POST",
         url: “XXXX”,
         data:"",
         dataType: "json",           
         success: fnSuccInfo,
         error: fnErrorCallBack
     });2.function fnSuccInfo(dataJson)
{
  console.log("dataJson==="+dataJson.result);
  
  var iLen = dataJson.data.length;
  
  for(var i=0; i<iLen; i++)
 {
   dataJson.data[i].属性
}

Answer 2

alert(json[0]["20170915"]["131003"].REG_TOTAL_NUM);    alert(json[1]["20170916"]["131003"].REG_TOTAL_NUM); 这样是可以的。  你的问题是 你遍历 的时候，并不是每个元素下边都有，20170915和20170916 节点

Answer 3

alert(json[1]["20170916"]["131003"].REG_TOTAL_NUM);
这样是可以的    但为什么会弹7次

Answer 4

json=[{
        "20170915": {
            "131082": {
                "REG_TOTAL_NUM": "173",
                "ACC_TOTAL_NUM": "173"
               
            },
            "131028": {
                "REG_TOTAL_NUM": "2",
                "ACC_TOTAL_NUM": "2"
               
            },
            "131022": {
                "REG_TOTAL_NUM": "260",
                "ACC_TOTAL_NUM": "260"
               
            },
            "131024": {
                "REG_TOTAL_NUM": "31",
                "ACC_TOTAL_NUM": "31"
               
            },
            "131025": {
                "REG_TOTAL_NUM": "4",
                "ACC_TOTAL_NUM": "4"
                
            },
            "131002": {
                "REG_TOTAL_NUM": "378",
                "ACC_TOTAL_NUM": "378"
               
            },
            "131003": {
                "REG_TOTAL_NUM": "346",
                "ACC_TOTAL_NUM": "346"
               
            },
            "131026": {
                "REG_TOTAL_NUM": "1",
                "ACC_TOTAL_NUM": "1"
             
            },
            "131023": {
                "REG_TOTAL_NUM": "1362",
                "ACC_TOTAL_NUM": "1331"
               
            },
            "131081": {
                "REG_TOTAL_NUM": "129",
                "ACC_TOTAL_NUM": "113"
               
            }
        }
},
    {
        "20170916": {
            "131082": {
                "REG_TOTAL_NUM": "252",
                "ACC_TOTAL_NUM": "252"
               
            },
            "131028": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
                
            },
            "131022": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
               
            },
            "131024": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
                
            },
            "131025": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
              
            },
            "131002": {
                "REG_TOTAL_NUM": "538",
                "ACC_TOTAL_NUM": "538"
               
            },
            "131003": {
                "REG_TOTAL_NUM": "332",
                "ACC_TOTAL_NUM": "332"
              
            },
            "131026": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
              
            },
            "131023": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
               
            },
            "131081": {
                "REG_TOTAL_NUM": "0",
                "ACC_TOTAL_NUM": "0"
              
            }
        }
}];for(var i in json){
if(json[i]["20170915"]!=null){
alert(json[0]["20170915"]["131003"].REG_TOTAL_NUM);
}

if(json[i]["20170916"]!=null){
alert(json[1]["20170916"]["131003"].REG_TOTAL_NUM);
}
}
你的问题是 并不是每个遍历的元素中都有 20170916和20170915  元素 。