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Accepted
Vanya Guk
Asked:2020-05-04 23:39:38 +0000 UTC2020-05-04 23:39:38 +0000 UTC

如何检查一个元素是否在js中的数组中？

  • 772

var users = [{
      id: 12,
      name: Adam
   },{
      id: 14,
      name: Bob
   },{
      id: 16,
      name: Charlie
   },{
      id: 18,
      name: David
   }
]

如何检查此类数组中是否存在值为 18 的 id 属性

javascript

2 个回答

  1. https://www.w3schools.com/jsref/jsref_some.asp

    var users = [{
  id: 12,
  name: "Adam"
}, {
  id: 14,
  name: "Bob"
}, {
  id: 16,
  name: "Charlie"
}, {
  id: 18,
  name: "David"
}];

var found = users.some(item => item.id == 18);
console.log(found);

    • 2
  2. Best Answer

    如果在没有第三方库的本机 js 上，则：

    const users = [{
      id: 12,
      name: Adam
   },{
      id: 14,
      name: Bob
   },{
      id: 16,
      name: Charlie
   },{
      id: 18,
     name: David
  }
]
function findElement(id) {
    const user =  users.find( (el) => el.id === id );
    if (user) { 
        return user;
    } else {
        return "user not found";
    }
}

findElement(18);
    • 1

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