709

如何从数组中删除对象?我希望从中删除包含名称的Kristian对象someArray。例如:

someArray = [{name:"Kristian", lines:"2,5,10"},
             {name:"John", lines:"1,19,26,96"}];

我想实现:

someArray = [{name:"John", lines:"1,19,26,96"}];
4

31 回答 31

936

您可以使用多种方法从数组中删除项目:

//1
someArray.shift(); // first element removed
//2
someArray = someArray.slice(1); // first element removed
//3
someArray.splice(0, 1); // first element removed
//4
someArray.pop(); // last element removed
//5
someArray = someArray.slice(0, someArray.length - 1); // last element removed
//6
someArray.length = someArray.length - 1; // last element removed

如果要删除 position 的元素x,请使用:

someArray.splice(x, 1);

或者

someArray = someArray.slice(0, x).concat(someArray.slice(-x));

回复@chill182Array.filter的评论:可以使用,或者Array.splice结合Array.findIndex(见MDN )从数组中删除一个或多个元素,例如

// non destructive filter > noJohn = John removed, but someArray will not change
let someArray = getArray();
let noJohn = someArray.filter( el => el.name !== "John" ); 
log(`let noJohn = someArray.filter( el => el.name !== "John")`,
  `non destructive filter [noJohn] =`, format(noJohn));
log(`**someArray.length ${someArray.length}`);

// destructive filter/reassign John removed > someArray2 =
let someArray2 = getArray();
someArray2 = someArray2.filter( el => el.name !== "John" );
log("", 
  `someArray2 = someArray2.filter( el => el.name !== "John" )`,
  `destructive filter/reassign John removed [someArray2] =`, 
  format(someArray2));
log(`**someArray2.length after filter ${someArray2.length}`);

// destructive splice /w findIndex Brian remains > someArray3 =
let someArray3 = getArray();
someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1);
someArray3.splice(someArray3.findIndex(v => v.name === "John"), 1);
log("",
  `someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1),`,
  `destructive splice /w findIndex Brian remains [someArray3] =`, 
  format(someArray3));
log(`**someArray3.length after splice ${someArray3.length}`);

// if you're not sure about the contents of your array, 
// you should check the results of findIndex first
let someArray4 = getArray();
const indx = someArray4.findIndex(v => v.name === "Michael");
someArray4.splice(indx, indx >= 0 ? 1 : 0);
log("", `someArray4.splice(indx, indx >= 0 ? 1 : 0)`,
  `check findIndex result first [someArray4] = (nothing is removed)`,
  format(someArray4));
log(`**someArray4.length (should still be 3) ${someArray4.length}`);

// -- helpers -- 
function format(obj) {
  return JSON.stringify(obj, null, " ");
}

function log(...txt) {
  document.querySelector("pre").textContent += `${txt.join("\n")}\n`
}

function getArray() {
  return [ {name: "Kristian", lines: "2,5,10"},
           {name: "John", lines: "1,19,26,96"},
           {name: "Brian", lines: "3,9,62,36"} ];
}
<pre>
**Results**

</pre>

于 2012-04-05T08:11:37.143 回答
230

干净的解决方案是使用Array.filter

var filtered = someArray.filter(function(el) { return el.Name != "Kristian"; }); 

问题在于它不适用于 IE < 9。但是,您可以包含来自 Javascript 库(例如underscore.js)的代码,该库为任何浏览器实现此功能。

于 2012-04-05T08:11:44.387 回答
144

我建议使用 lodash.js 或sugar.js来完成以下常见任务:

// lodash.js
someArray = _.reject(someArray, function(el) { return el.Name === "Kristian"; });

// sugar.js
someArray.remove(function(el) { return el.Name === "Kristian"; });

在大多数项目中,拥有一组由此类库提供的辅助方法非常有用。

于 2012-04-05T08:14:01.680 回答
95

这个怎么样?

$.each(someArray, function(i){
    if(someArray[i].name === 'Kristian') {
        someArray.splice(i,1);
        return false;
    }
});
于 2012-04-11T20:54:50.590 回答
93

ES2015

let someArray = [
               {name:"Kristian", lines:"2,5,10"},
               {name:"John", lines:"1,19,26,96"},
               {name:"Kristian", lines:"2,58,160"},
               {name:"Felix", lines:"1,19,26,96"}
            ];

someArray = someArray.filter(person => person.name != 'John');

它将删除约翰

于 2017-08-08T18:50:38.793 回答
76

如图所示,您的“数组”是无效的 JavaScript 语法。花括号{}用于具有属性名称/值对的对象,但方括号[]用于数组 - 如下所示:

someArray = [{name:"Kristian", lines:"2,5,10"}, {name:"John", lines:"1,19,26,96"}];

在这种情况下,您可以使用该.splice()方法删除项目。要删除第一项(索引 0),请说:

someArray.splice(0,1);

// someArray = [{name:"John", lines:"1,19,26,96"}];

如果您不知道索引但想在数组中搜索以找到名称为“Kristian”的项目以删除您可以这样做:

for (var i =0; i < someArray.length; i++)
   if (someArray[i].name === "Kristian") {
      someArray.splice(i,1);
      break;
   }

编辑:我刚刚注意到您的问题被标记为“jQuery”,因此您可以尝试以下$.grep()方法

someArray = $.grep(someArray,
                   function(o,i) { return o.name === "Kristian"; },
                   true);
于 2012-04-05T08:12:27.973 回答
56

你可以使用array.filter()。

例如

        someArray = [{name:"Kristian", lines:"2,5,10"},
                     {name:"John", lines:"1,19,26,96"}];

        someArray = someArray.filter(function(returnableObjects){
               return returnableObjects.name !== 'Kristian';
        });

        //someArray will now be = [{name:"John", lines:"1,19,26,96"}];

箭头功能:

someArray = someArray.filter(x => x.name !== 'Kristian')
于 2015-04-18T12:14:04.990 回答
20

我制作了一个动态函数,获取对象数组、键和值,并在删除所需对象后返回相同的数组:

function removeFunction (myObjects,prop,valu)
        {
             return myObjects.filter(function (val) {
              return val[prop] !== valu;
          });

        }

完整示例:DEMO

var obj = {
            "results": [
              {
                  "id": "460",
                  "name": "Widget 1",
                  "loc": "Shed"
              }, {
                  "id": "461",
                  "name": "Widget 2",
                  "loc": "Kitchen"
              }, {
                  "id": "462",
                  "name": "Widget 3",
                  "loc": "bath"
              }
            ]
            };


        function removeFunction (myObjects,prop,valu)
        {
             return myObjects.filter(function (val) {
              return val[prop] !== valu;
          });

        }


console.log(removeFunction(obj.results,"id","460"));
于 2013-05-07T04:01:52.693 回答
17

这是一个对我有用的功能:

function removeFromArray(array, value) {
    var idx = array.indexOf(value);
    if (idx !== -1) {
        array.splice(idx, 1);
    }
    return array;
}
于 2014-07-18T15:50:47.223 回答
13

你也可以尝试做这样的事情:

var myArray = [{'name': 'test'}, {'name':'test2'}];
var myObject = {'name': 'test'};
myArray.splice(myArray.indexOf(myObject),1);
于 2017-07-27T08:06:42.273 回答
12
someArray = jQuery.grep(someArray , function (value) {
        return value.name != 'Kristian';
});
于 2013-07-26T18:00:46.720 回答
10

在数组上使用拼接函数。指定开始元素的位置和要删除的子序列的长度。

someArray.splice(pos, 1);
于 2012-04-05T08:10:22.923 回答
10

为使用数组的简单工作投票支持UndercoreJS

_.without()函数有助于删除元素:

 _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
    => [2, 3, 4]
于 2013-03-27T12:29:47.273 回答
10
const someArray = [{name:"Kristian", lines:"2,5,10"}, {name:"John", lines:"1,19,26,96"}];

我们得到名称属性值为“Kristian”的对象的索引

const index = someArray.findIndex(key => key.name === "Kristian");
console.log(index); // 0

通过使用 splice 函数,我们正在删除 name 属性值为“Kristian”的对象

someArray.splice(index,1);
console.log(someArray); // [{name:"John", lines:"1,19,26,96"}]
于 2021-08-03T18:26:38.730 回答
9

表现

今天 2021.01.27,我在 Chrome v88、Safari v13.1.2 和 Firefox v84 上对 MacOs HighSierra 10.13.6 进行测试,以选择解决方案。

结果

对于所有浏览器:

  • 元素不存在时的快速/最快解决方案:A 和 B
  • 大阵列的快速/最快解决方案:C
  • 元素存在时大数组的快速/最快解决方案:H
  • 小阵列的相当慢的解决方案:F 和 G
  • 大型阵列的非常慢的解决方案:D、E 和 F

在此处输入图像描述

细节

我执行 4 个测试用例:

下面的片段展示了解决方案 A B C D E F G H I之间的差异

function A(arr, name) {
  let idx = arr.findIndex(o => o.name==name);
  if(idx>=0) arr.splice(idx, 1);
  return arr;
}


function B(arr, name) {
  let idx = arr.findIndex(o => o.name==name);
  return idx<0 ? arr : arr.slice(0,idx).concat(arr.slice(idx+1,arr.length));
}


function C(arr, name) {
  let idx = arr.findIndex(o => o.name==name);
  delete arr[idx];
  return arr;
}


function D(arr, name) {
  return arr.filter(el => el.name != name);
}


function E(arr, name) {
  let result = [];
  arr.forEach(o => o.name==name || result.push(o));
  return result;
}


function F(arr, name) {
  return _.reject(arr, el => el.name == name);
}


function G(arr, name) {
  let o = arr.find(o => o.name==name);
  return _.without(arr,o);
}


function H(arr, name) {
  $.each(arr, function(i){
      if(arr[i].name === 'Kristian') {
          arr.splice(i,1);
          return false;
      }
  });
  return arr;
}


function I(arr, name) {
  return $.grep(arr,o => o.name!=name);
}








// Test
let test1 = [   
    {name:"Kristian", lines:"2,5,10"},
    {name:"John", lines:"1,19,26,96"},  
];

let test2 = [   
    {name:"John3", lines:"1,19,26,96"},
    {name:"Kristian", lines:"2,5,10"},
    {name:"John", lines:"1,19,26,96"},
  {name:"Joh2", lines:"1,19,26,96"},
];

let test3 = [   
    {name:"John3", lines:"1,19,26,96"},
    {name:"John", lines:"1,19,26,96"},
  {name:"Joh2", lines:"1,19,26,96"},
];

console.log(`
Test1: original array from question
Test2: array with more data
Test3: array without element which we want to delete
`);

[A,B,C,D,E,F,G,H,I].forEach(f=> console.log(`
Test1 ${f.name}: ${JSON.stringify(f([...test1],"Kristian"))}
Test2 ${f.name}: ${JSON.stringify(f([...test2],"Kristian"))}
Test3 ${f.name}: ${JSON.stringify(f([...test3],"Kristian"))}
`));
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
  
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js" integrity="sha512-90vH1Z83AJY9DmlWa8WkjkV79yfS2n2Oxhsi2dZbIv0nC4E6m5AbH8Nh156kkM7JePmqD6tcZsfad1ueoaovww==" crossorigin="anonymous"> </script>
  
This shippet only presents functions used in performance tests - it not perform tests itself!

这是 chrome 的示例结果

在此处输入图像描述

于 2021-01-27T19:31:16.590 回答
9

这是一个带有 map 和 splice 的示例

const arrayObject = [
  { name: "name1", value: "value1" },
  { name: "name2", value: "value2" },
  { name: "name3", value: "value3" },
];

let index = arrayObject.map((item) => item.name).indexOf("name1");
if (index > -1) {
  arrayObject.splice(index, 1);
  console.log("Result", arrayObject);
}

输出

Result [
  {
    "name": "name2",
    "value": "value2"
  },
  {
    "name": "name3",
    "value": "value3"
  }
]
于 2020-10-03T21:42:49.500 回答
6

带 ES 6 箭头功能

let someArray = [
                 {name:"Kristian", lines:"2,5,10"},
                 {name:"John", lines:"1,19,26,96"}
                ];
let arrayToRemove={name:"Kristian", lines:"2,5,10"};
someArray=someArray.filter((e)=>e.name !=arrayToRemove.name && e.lines!= arrayToRemove.lines)
于 2017-11-29T14:30:42.877 回答
4

虽然这可能不适合这种情况,但前几天我发现delete如果您不需要更改数组的大小,您也可以使用关键字从数组中删除项目,例如

var myArray = [1,2,3];

delete myArray[1];

console.log(myArray[1]); //undefined

console.log(myArray.length); //3 - doesn't actually shrink the array down
于 2012-04-05T08:40:23.023 回答
3

最简单的解决方案是创建一个按名称存储每个对象的索引的映射,如下所示:

//adding to array
var newPerson = {name:"Kristian", lines:"2,5,10"}
someMap[ newPerson.name ] = someArray.length;
someArray.push( newPerson );

//deleting from the array
var index = someMap[ 'Kristian' ];
someArray.splice( index, 1 );
于 2012-04-05T08:12:25.057 回答
3

如果要删除给定对象的所有出现(基于某些条件),请在 for 循环中使用 javascript splice 方法。

由于删除对象会影响数组长度,因此请确保将计数器递减一步,以便长度检查保持不变。

var objArr=[{Name:"Alex", Age:62},
  {Name:"Robert", Age:18},
  {Name:"Prince", Age:28},
  {Name:"Cesar", Age:38},
  {Name:"Sam", Age:42},
  {Name:"David", Age:52}
];

for(var i = 0;i < objArr.length; i ++)
{
  if(objArr[i].Age > 20)
  {
    objArr.splice(i, 1);
    i--;  //re-adjust the counter.
  }
}

上面的代码片段删除了所有年龄大于 20 的对象。

于 2018-06-15T20:10:15.037 回答
3

您也可以使用地图功能。

someArray = [{name:"Kristian", lines:"2,5,10"},{name:"John",lines:"1,19,26,96"}];
newArray=[];
someArray.map(function(obj, index){
    if(obj.name !== "Kristian"){
       newArray.push(obj);
    }
});
someArray = newArray;
console.log(someArray);
于 2017-03-05T09:48:07.900 回答
3

这个答案

for (var i =0; i < someArray.length; i++)
   if (someArray[i].name === "Kristian") {
      someArray.splice(i,1);
   }

不适用于满足条件的多个记录。如果您有两条这样的连续记录,则仅删除第一条,跳过另一条。你必须使用:

for (var i = someArray.length - 1; i>= 0; i--)
   ...

反而 。

于 2018-07-27T09:48:05.303 回答
2

你的数组语法似乎有一个错误,所以假设你的意思是一个数组而不是一个对象,Array.splice是你的朋友:

someArray = [{name:"Kristian", lines:"2,5,10"}, {name:"John", lines:"1,19,26,96"}];
someArray.splice(1,1)
于 2012-04-05T08:13:56.287 回答
2

使用 javascript 的 splice() 函数。

这可能会有所帮助:http ://www.w3schools.com/jsref/jsref_splice.asp

于 2012-04-05T11:13:46.210 回答
2

你也可以使用some

someArray = [{name:"Kristian", lines:"2,5,10"},
             {name:"John", lines:"1,19,26,96"}];

someArray.some(item => { 
    if(item.name === "Kristian") // Case sensitive, will only remove first instance
        someArray.splice(someArray.indexOf(item),1) 
})
于 2017-07-06T18:59:23.817 回答
2

我想答案是非常分支和打结的。

您可以使用以下路径删除与现代 JavaScript 术语中给出的对象匹配的数组对象。


coordinates = [
    { lat: 36.779098444109145, lng: 34.57202827508546 },
    { lat: 36.778754712956506, lng: 34.56898128564454 },
    { lat: 36.777414146732426, lng: 34.57179224069215 }
];

coordinate = { lat: 36.779098444109145, lng: 34.57202827508546 };

removeCoordinate(coordinate: Coordinate): Coordinate {
    const found = this.coordinates.find((coordinate) => coordinate == coordinate);
    if (found) {
      this.coordinates.splice(found, 1);
    }
    return coordinate;
  }
于 2020-06-10T06:40:53.430 回答
2

这就是我使用的。

Array.prototype.delete = function(pos){
    this[pos] = undefined;
    var len = this.length - 1;
    for(var a = pos;a < this.length - 1;a++){
      this[a] = this[a+1];
    }
    this.pop();
  }

然后就是这么简单

var myArray = [1,2,3,4,5,6,7,8,9];
myArray.delete(3);

用任意数字代替三。之后预期的输出应该是:

console.log(myArray); //Expected output 1,2,3,5,6,7,8,9
于 2018-04-05T00:03:50.080 回答
1

splice(i, 1) 其中 i 是数组的增量索引将删除对象。但请记住 splice 也会重置数组长度,因此请注意“未定义”。使用您的示例,如果您删除“Kristian”,那么在循环内的下一次执行中,i 将为 2,但 someArray 的长度为 1,因此如果您尝试删除“John”,您将收到“未定义”错误. 一个解决方案虽然不优雅,但有一个单独的计数器来跟踪要删除的元素的索引。

于 2014-10-09T23:45:00.867 回答
1

name仅返回属性不是“Kristian”的数组中的对象

var noKristianArray = $.grep(someArray, function (el) { return el.name!= "Kristian"; });


演示:

 var someArray = [
                {name:"Kristian", lines:"2,5,10"},
                {name:"John", lines:"1,19,26,96"},
                {name:"Kristian", lines:"2,58,160"},
                {name:"Felix", lines:"1,19,26,96"}
                ];
			 
var noKristianArray = $.grep(someArray, function (el) { return el.name!= "Kristian"; });

console.log(noKristianArray);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

于 2017-02-09T18:42:53.707 回答
0

这个概念使用剑道网格

var grid = $("#addNewAllergies").data("kendoGrid");

var selectedItem = SelectedCheckBoxList;

for (var i = 0; i < selectedItem.length; i++) {
    if(selectedItem[i].boolKendoValue==true)
    {
        selectedItem.length= 0;
    }
}
于 2017-08-04T11:48:26.403 回答
0

如果您知道数组中的对象没有任何属性(或者可能是唯一的),但是您有对要删除的对象的引用,则可以执行unregisterObject以下方法中的操作:

let registeredObjects = [];

function registerObject(someObject) { registeredObjects.push(someObject); }
function unregisterObject(someObject) { registeredObjects = registeredObjects.filter(obj => obj !== someObject); }

let myObject1 = {hidden: "someValue1"}; // Let's pretend we don't know the hidden attribute
let myObject2 = {hidden: "someValue2"};

registerObject(myObject1);
registerObject(myObject2);
console.log(`There are ${registeredObjects.length} objects registered. They are: ${JSON.stringify(registeredObjects)}`);

unregisterObject(myObject1);
console.log(`There are ${registeredObjects.length} objects registered. They are: ${JSON.stringify(registeredObjects)}`);

于 2021-07-08T20:04:35.377 回答