Question

我在对象中有一个数组，如下所示：

[
{ "id": 244, "title": "myBook.pdf", "author": "Kevin"},
{ "id": 370, "title": "Bookpress.pdf", "author": "Justin"},
{ "id": 433, "title": "Uptown.pdf", "author": "David"},
]

如何获取所有标题数据的所有数据？所需数据是： myBook.pdf，Bookpress.pdf，Uptown.pdf

Answer 1

如果您使用的是lodash，则只需执行此操作

即可

var data = [
  { "id": 244, "title": "myBook.pdf", "author": "Kevin"},
  { "id": 370, "title": "Bookpress.pdf", "author": "Justin"},
  { "id": 433, "title": "Uptown.pdf", "author": "David"},
]

var result = _(data).map("title").value();

给你

result
(3) ["myBook.pdf", "Bookpress.pdf", "Uptown.pdf"]

但是，因为这听起来像是一个任务问题，你应该尝试自己做这个没有库。

Answer 2

只需使用Array#map函数.use join(',')函数来应用逗号

＆＃13;

var arr = [
{ "id": 244, "title": "myBook.pdf", "author": "Kevin"},
{ "id": 370, "title": "Bookpress.pdf", "author": "Justin"},
{ "id": 433, "title": "Uptown.pdf", "author": "David"},
]

console.log(arr.map(a=> a.title))
console.log(arr.map(a=> a.title).join(','))

＆＃13;

Answer 3

使用for循环遍历数组并使用javascript对象表示法来获取所需的对象属性并将其附加到html中或以您喜欢的任何方式使用。

request.getErrorStream()

var arr =[
{ "id": 244, "title": "myBook.pdf", "author": "Kevin"},
{ "id": 370, "title": "Bookpress.pdf", "author": "Justin"},
{ "id": 433, "title": "Uptown.pdf", "author": "David"},
]

for (var i =0;i < arr.length;i++){

var el = document.getElementById("demo");
el.innerHTML += arr[i].title
}

从对象获取数组数据

3 个答案: