javascript - 获取字典的键值

Question

如何从 javascript 字典中获取值？（我什至不知道它是否在javascript中称为字典）

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

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

Answer 1

在 JavaScript 中，字典是对象。要访问对象属性，您可以使用点表示法或方括号表示法。要迭代数组，您可以使用简单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);
}

Answer 2

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

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

Answer 3

You can loop through the data array like this:

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);
});

Answer 4

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))