Question

这是我的JSON对象，我希望在Javascript中找到所有具有Last Name = Smith和Age 36的元素。有没有聪明的方法，或者我必须通过所有数据循环两次？

[
  {
    "Name": "John",
    "Last Name": "Smith",
    "Age": "36",
    "Hobbies": "Fishing, Racecars"
  },
  {
    "Name": "John",
    "Last Name": "Derre",
    "Age": "64",
    "Hobbies": ""
  },
  {
    "Name": "James",
    "Last Name": "Smith",
    "Age": "36",
    "Hobbies": "Computer"
  },
  {
    "Name": "John",
    "Last Name": "Do",
    "Age": "25",
    "Hobbies": "Comics, Music"
  }
]

Answer 1

您可以使用Array.filter限制匹配项目：

const matches = data.filter(item => item['Last Name'] === "Smith" && item.Age === "36")

Answer 2

您可以将对象用作搜索参数

{
    'Last Name': 'Smith',
    'Age': '36'
}

对更多属性进行更动态的过滤。

var array = [{ Name: "John", "Last Name": "Smith", Age: "36", Hobbies: "Fishing, Racecars" }, { Name: "John", "Last Name": "Derre", Age: "64", Hobbies: "" }, { Name: "James", "Last Name": "Smith", Age: "36", Hobbies: "Computer" }, { Name: "John", "Last Name": "Do", Age: "25", Hobbies: "Comics, Music" }],
    search = { 'Last Name': 'Smith', Age: '36' },
    result = array.filter((keys => o => keys.every(k => o[k] === search[k]))(Object.keys(search)));

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

下划线JS库有一些方便的方法来处理数据集合 - 例如，select方法

var found = _.select(userInfo, function(node){
    return (node.Name === "John" && node.Age === "25")
}); 
console.dir (found);

如何在Javascript中通过2个属性值查找JSON对象

3 个答案: