javascript 获取字典的键值

Get key value of dictionary

提问by user984003

How do I get the value from a javascript dictionary? (I don't even know if it's called a dictionary in javascript)

如何从 javascript 字典中获取值？（我什至不知道它在javascript中是否称为字典）

I get the following object (friends) from the facebook sdk. How do I, for example, loop through the names?

我从 facebook sdk 得到以下对象（朋友）。例如，我如何遍历名称？

{data: [{id: "xxxxx", name: "Friend name"}, {id: "xxxxx", name: "Friend name"}]}

回答by VisioN

In JavaScript dictionaries are objects. To access object properties you may use either dot notation or square brackets notation. To iterate an array you may use simple forloop.

在 JavaScript 中，字典是对象。要访问对象属性，您可以使用点符号或方括号符号。要迭代数组，您可以使用简单的for循环。

var obj = {
        data: [{
            id: "xxxxx",
            name: "Friend name"
        }, {
            id: "xxxxx",
            name: "Friend name"
        }]
    };

for (var i = 0, len = obj.data.length; i < len; i++) {
    console.log(obj.data[i].name);
}

回答by Andy

Loop through the data array within the object that wraps the whole thing. Then target the name with object dot notation:

循环遍历包装整个事物的对象内的数据数组。然后使用对象点符号定位名称：

for (var i = 0, l = obj.data.length; i < l; i++) {
  console.log(obj.data[i].name);
}

回答by Vlad Bezden

You can use mapfunction.

您可以使用地图功能。

const obj = {
  data: [{
    id: "xxxxx",
    name: "Friend name"
  }, {
    id: "xxxxx",
    name: "Friend name"
  }]
}

obj.data.map(x => console.log(x.name))

回答by Naftali aka Neal

You can loop through the dataarray like this:

您可以data像这样循环遍历数组：

var obj = {data: [{id: "xxxxx", name: "Friend name"}, {id: "xxxxx", name: "Friend name"}]};

//loop thru objects in data
obj.data.forEach(function(itm)  {
   console.log(itm.name);
});