Question

我有一个带有下述格式的json文件

mydata.json

{
    "nodes":{
        "Aidan":{"color":"green", "shape":"dot", "alpha":1, "id" : "aidan"},
        "Sofia":{"color":"green", "shape":"dot", "alpha":1},
        "Liam":{"color":"GoldenRod", "shape":"dot", "alpha":1}
    },
    "edges":{
        "Quinn":{
            "Liam":{"length":2.5,"weight":2},
            "Audrey":{"length":2.5,"weight":2},
            "Noah":{"length":2.5,"weight":2},
            "Claire":{"length":2.5,"weight":2}
        },
        "Liam":{
            "Sofia":{"length":2.5,"weight":2},
            "Ethan":{"length":2.5,"weight":2},
            "Amelia":{"length":2.5,"weight":2}
        }
    }
}

我将使用jquery读取上面的文件数据，如下所述

var data = $.getJSON("data/mydata.json",function(data){
    var nodes = data.nodes;
    var edges = data.edges;

    //i want to access first element or between element.
    //like var edge = edges.get(0) or nodes.get("aidan")
})

我想访问第一个元素或元素之间的索引或对象的name属性。比如var edge = edges.get（0）或nodes.get（＆＃34; aidan＆＃34;）。

谢谢

Answer 1

有几种方法可以做到这一点

Object.keys(nodes)[0]; //retrieve the first key
edges['Quinn'];
edges.Quinn

第一个上面的一点警告，JS中的Object是无序的，因此它可能会中断，因此浏览器倾向于保持插入顺序。希望它有所帮助

Answer 2

试试此代码

nodes['aidan']
edges['Quinn']

Answer 3

前面提到的代码

nodes['aidan']

或

nodes.aidan

应该同样合适。

Answer 4

为您准备了fiddle。你可以在那里查看。

如何从json数据访问第一个或特定对象

4 个答案: