javascript - 使用 Javascript 过滤 Json

Question

你好，你能帮我过滤这样的Json对象吗:

{
    "data": {
        "statuses": [{
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name1"
                }]
            },
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name2"
                }]
            },
            "entities": {
                "urls": [],
                "user_mentions": [{
                    "screen_name": "name3"
                }]
            }
        }]
    }
}

我需要获取包含每个键 screen_name 值的数组。例如:array = ["name1","name2","name3"]我如何在没有框架的情况下仅使用 JS 来做到这一点？

感谢您的帮助。我已将 Json 更新为如下所示:

var obj = {
"data": {
    "statuses": [{
        "urls": [],
        "user_mentions": [{
            "indices": [
                3,
                16
            ],
            "id_str": "626444770",
            "id": 626444770,
            "name": "katheryn",
            "screen_name": "sella_sandra"
        }, {
            "indices": [
                "***",
                "***"
            ],
            "id_str": "21447363",
            "id": 21447363,
            "name": "KATY PERRY",
            "screen_name": "katyperry"
        }, {
            "indices": [
                "***",
                "***"
            ],
            "id_str": "21447363",
            "id": 21447363,
            "name": "KATY PERRY",
            "screen_name": "floyd"
        }]
    }]
}

我想获取 screen_names 数组。我写了这样的代码。但是当我使用 for 时。它在这里不起作用:

console.log (statuses[0].user_mentions[i].screen_name)我不是一个愚蠢的错误，但我不知道它有多正确。帮助大家!

var statuses = obj.data.statuses;
for (var i=0; i<statuses.length; i++ )

 { if ( typeof statuses[0].user_mentions !== "undefined")
            {    
               for (var i=0; i<statuses.length; i++){
                  console.log (statuses[0].user_mentions[i].screen_name);
            }
        } 

    else console.log ="No senders";
}

Answer 1

您的语法不正确，因为在 statuses 数组中您不能拥有其他键值数据。

删除实体键名，假设它只是一个对象数组，然后尝试这个

var obj = { "data": {
  "statuses": [
    {
      "urls": [],
      "user_mentions": [{
        "screen_name": "name1"
      }]
    },
    {  
      "urls": [],
      "user_mentions": [{
        "screen_name": "name2"
      }]
    },
    {  
      "urls": [],
      "user_mentions": [{
        "screen_name": "name3"
      }]
    }
  ]
} };

var statuses = obj.data.statuses;
var names = [];
for (var counter = 0; counter < statuses.length; counter++ )
{
   names.push( statuses[ counter ].user_mentions[0].screen_name ); 
}
console.log( names );