让我们看一个例子。

var arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});

我需要合并对象的这两个数组并创建以下数组：

arr3 = new Array({name: "lang", value: "German"}, {name: "age", value: "18"}, {name : "childs", value: '5'});

有没有JavaScript或jQuery函数可以做到这一点？

$.extend不适合我。它返回

arr4 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});

如果要在JavaScript中合并2个对象数组。您可以使用这一招

Array.prototype.push.apply(arr1,arr2);

例如

var arr1 = [{name: "lang", value: "English"},{name: "age", value: "18"}];
var arr2 = [{name : "childs", value: '5'}, {name: "lang", value: "German"}];

Array.prototype.push.apply(arr1,arr2); 

console.log(arr1);  // final merged result will be in arr1

输出：

[{"name":"lang","value":"English"},
{"name":"age","value":"18"},
{"name":"childs","value":"5"},
{"name":"lang","value":"German"}]

使用ES6，您可以如下轻松完成操作：

var arr1 = new Array({name: "lang", value: "German"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});
var arr3 = [...arr1, ...arr2];

输出：

    arr3 = [
      {"name":"lang","value":"German"},
      {"name":"age","value":"18"},
      {"name":"childs","value":"5"},
      {"name":"lang","value":"German"}
    ]

对于那些正在尝试现代事物的人：

var odd = [
    { name : "1", arr: "in odd" },
    { name : "3", arr: "in odd" }
];

var even = [
    { name : "1", arr: "in even" },
    { name : "2", arr: "in even" },
    { name : "4", arr: "in even" }
];

// ----
// ES5 using Array.filter and Array.find
function merge(a, b, prop){
  var reduced = a.filter(function(aitem){
      return ! b.find(function(bitem){
          return aitem[prop] === bitem[prop];
      });
  });
  return reduced.concat(b);
}
console.log( "ES5", merge(odd, even, "name") );

// ----
// ES6 arrow functions
function merge(a, b, prop){
    var reduced =  a.filter( aitem => ! b.find ( bitem => aitem[prop] === bitem[prop]) )
  return reduced.concat(b);
}
console.log( "ES6", merge(odd, even, "name") );

// ----
// ES6 one-liner
var merge = (a, b, p) => a.filter( aa => ! b.find ( bb => aa[p] === bb[p]) ).concat(b);


console.log( "ES6 one-liner", merge(odd, even, "name") );

// Results
// ( stuff in the "b" array replaces things in the "a" array )
// [
//    {
//         "name": "3",
//         "arr": "in odd"
//     },
//     {
//         "name": "1",
//         "arr": "in even"
//     },
//     {
//         "name": "2",
//         "arr": "in even"
//     },
//     {
//         "name": "4",
//         "arr": "in even"
//     }
// ]

更新2019年10月12日

仅基于较新的Javascript的新版本，而无需任何第三方库。

const mergeByProperty = (target, source, prop) => {
  source.forEach(sourceElement => {
    let targetElement = target.find(targetElement => {
      return sourceElement[prop] === targetElement[prop];
    })
    targetElement ? Object.assign(targetElement, sourceElement) : target.push(sourceElement);
  })
}
var target /* arr1 */ = [{name: "lang", value: "English"}, {name: "age", value: "18"}];
var source /* arr2 */ = [{name : "childs", value: '5'}, {name: "lang", value: "German"}];

mergeByProperty(target, source, 'name');

console.log(target)

这个答案越来越老了，如今越来越不需要像lodash和unders下的lib。在这个新版本中，目标（arr1）数组是我们正在使用的数组，并且希望保持最新状态。该源（ARR2）阵列是在新的数据是从哪里来的，我们希望它融入我们的目标阵列。

我们遍历源数组以查找新数据，对于在目标数组中尚未找到的每个对象，我们只需使用target.push（sourceElement）添加该对象， 如果基于我们的键属性（'name'）， object已经在目标数组中-我们使用Object.assign（targetElement，sourceElement）更新其属性和值。我们的“目标”将始终是相同的数组并具有更新的内容。

使用下划线或破折号的旧答案

我总是从Google到达这里，而我总是对答案不满意。您的回答很好，但是使用underscore.js会更轻松更整洁

演示：http : //jsfiddle.net/guya/eAWKR/

这是一个更通用的函数，它将使用其对象的属性合并两个数组。在这种情况下，属性为“名称”

var arr1 = [{name: "lang", value: "English"}, {name: "age", value: "18"}];
var arr2 = [{name : "childs", value: '5'}, {name: "lang", value: "German"}];

function mergeByProperty(arr1, arr2, prop) {
  _.each(arr2, function(arr2obj) {
    var arr1obj = _.find(arr1, function(arr1obj) {
      return arr1obj[prop] === arr2obj[prop];
    });

    arr1obj ? _.extend(arr1obj, arr2obj) : arr1.push(arr2obj);
  });
}

mergeByProperty(arr1, arr2, 'name');

console.log(arr1);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.core.min.js"></script>

[{name: "lang", value: "German"}, {name: "age", value: "18"}, {name : "childs", value: '5'}]

var arr3 = [];
for(var i in arr1){
   var shared = false;
   for (var j in arr2)
       if (arr2[j].name == arr1[i].name) {
           shared = true;
           break;
       }
   if(!shared) arr3.push(arr1[i])
}
arr3 = arr3.concat(arr2);

使用ES6传播算子非常简单：

const array1 = [{a: 'HI!'}, {b: 'HOW'}]
const array2 = [{c: 'ARE'}, {d: 'YOU?'}]

const mergedArray = [ ...array1, ...array2 ]
console.log('Merged Array: ', mergedArray)

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

Merged Array: [ {a: 'HI!'}, {b: 'HOW'} {c: 'ARE'}, {d: 'YOU?'} ]

注意：上述解决方案是仅使用ES6扩展运算符合并两个阵列。

@ bh4r4th于2020年1月7日 进行编辑：由于我的初始解决方案后由于编辑而导致上下文发生更改。我想更新我的解决方案以符合当前标准。即

1. 合并数组对象而不创建重复的对象，并且

2. value如果name属性在先前的数组中已经存在，则更新

const arr1 = [
    { name: "lang", value: "English" },
    { name: "age", value: "18" }
]
const arr2 = [
    { name: "childs", value: '2' }, 
    { name: "lang", value: "German" }
]
const arr3 = [
    { name: "lang", value: "German" },
    { name: "age", value: "28" },
    { name: "childs", value: '5' }
]

// Convert to key value dictionary or object
const convertToKeyValueDict = arrayObj => {
    const val = {}
    arrayObj.forEach(ob => {
        val[ob.name] = ob.value
    })
    return val
}

// update or merge array
const updateOrMerge = (a1, a2) => {
    const ob1 = convertToKeyValueDict(a1)
    const ob2 = convertToKeyValueDict(a2)
    // Note: Spread operator with objects used here
    const merged_obj = {...ob1, ...ob2}
    const val = Object.entries(merged_obj)
    return val.map(obj => ({ name: obj[0], value: obj[1] }))
}

const v1 = updateOrMerge(arr1, arr2)
const v2 = updateOrMerge(v1, arr3)
console.log(`Merged array1 and array2: ${JSON.stringify(v1)} \n\n`)
console.log(`Merged above response and array3: ${JSON.stringify(v2)} \n\n`)

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

合并两个数组：

var arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});
var result=arr1.concat(arr2);
// result: [{name: "lang", value: "English"}, {name: "age", value: "18"}, {name : "childs", value: '5'}, {name: "lang", value: "German"}]

合并两个名称不重复的数组：

var arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});
var i,p,obj={},result=[];
for(i=0;i<arr1.length;i++)obj[arr1[i].name]=arr1[i].value;
for(i=0;i<arr2.length;i++)obj[arr2[i].name]=arr2[i].value;
for(p in obj)if(obj.hasOwnProperty(p))result.push({name:p,value:obj[p]});
// result: [{name: "lang", value: "German"}, {name: "age", value: "18"}, {name : "childs", value: '5'}]

最简单的方法是使用一些ES6魔术：

合并两个重复项：

const a = [{a: 1}, {b: 2}]
const b = [{a: 1}]

const result = a.concat(b) // [{a: 1}, {b: 2}, {a: 1}]

如果没有重复，则与上述内容相同：

const distinct = [...new Set(result.map(item => item.YOUR_PROP_HERE))]

使用lodash：

_.uniqBy([...arr1, ...arr2], 'name')

这就是我在ES6环境中解决类似问题的方式：

function merge(array1, array2, prop) {
    return array2.map(function (item2) {
        var item1 = array1.find(function (item1) {
            return item1[prop] === item2[prop];
        });
        return Object.assign({}, item1, item2);
    });
}

注意：此方法不会从array1返回未出现在array2中的任何项目。

编辑：我在某些情况下要保留未出现在第二个数组中的项目，所以我想出了另一种方法。

function mergeArrays(arrays, prop) {
    const merged = {};

    arrays.forEach(arr => {
        arr.forEach(item => {
            merged[item[prop]] = Object.assign({}, merged[item[prop]], item);
        });
    });

    return Object.values(merged);
}

var arr1 = [
    { name: 'Bob', age: 11 },
    { name: 'Ben', age: 12 },
    { name: 'Bill', age: 13 },
];

var arr2 = [
    { name: 'Bob', age: 22 },
    { name: 'Fred', age: 24 },
    { name: 'Jack', age: 25 },
    { name: 'Ben' },
];

console.log(mergeArrays([arr1, arr2], 'name'));

另一个版本使用reduce() method：

var arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});

var arr = arr1.concat(arr2).reduce(function(prev, current, index, array){ 
   
   if(!(current.name in prev.keys)) {
      prev.keys[current.name] = index;
      prev.result.push(current);   
   } 
   else{
       prev.result[prev.keys[current.name]] = current;
   }  

   return prev;
},{result: [], keys: {}}).result;
  
document.getElementById("output").innerHTML = JSON.stringify(arr,null,2);    

<pre id="output"/>

简单的解决方案

var tx = [{"id":1},{"id":2}];
var tx1 = [{"id":3},{"id":4}];


var txHistory = tx.concat(tx1)

console.log(txHistory); 
// output
 // [{"id":1},{"id":2},{"id":3},{"id":4}];

您可以在替换重复项时使用一个对象收集您的属性，然后将该对象扩展/展平为数组。像这样：

function merge(args) {
    args  = Array.prototype.slice.call(arguments);
    var o = { };
    for(var i = 0; i < args.length; ++i)
        for(var j = 0; j < args[i].length; ++j)
            o[args[i][j].name] = args[i][j].value;
    return o;
}

function expand(o) {
    var a = [ ];
    for(var p in o)
        if(o.hasOwnProperty(p))
            a.push({ name: p, value: o[p]});
    return a;
}

var arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
var arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});
var arr3 = expand(merge(arr1, arr2));

我不知道这是否是最快的方法，但是它适用于任意数量的输入数组。例如，这：

var a = expand(
    merge(
        [{name: "lang", value: "English"}, {name: "age", value: "18"}],
        [{name: "childs", value: '5'}, {name: "lang", value: "German"}],
        [{name: 'lang', value: 'Pancakes'}]
    )
);

为您提供了同样的事情，a那是在arr3用“德国”代替“煎饼”。

此方法确实假定您的对象都具有相同的对象 {name: ..., value: ...}形式。

您可以在这里看到它的运行状态（请打开控制台）：http : //jsfiddle.net/ambiguous/UtBbB/

jQuery Merge呢？

http://api.jquery.com/jQuery.merge/

此处的jsFiddle示例：http：//jsfiddle.net/ygByD/

我遇到了同样的问题，并且根据Guya的回答，我扩展了下划线库，还添加了我所需要的更多功能。这是要点。

/**
 * Merges two object-like arrays based on a key property and also merges its array-like attributes specified in objectPropertiesToMerge.
 * It also removes falsy values after merging object properties.
 *
 * @param firstArray The original object-like array.
 * @param secondArray An object-like array to add to the firstArray.
 * @param keyProperty The object property that will be used to check if objects from different arrays are the same or not.
 * @param objectPropertiesToMerge The list of object properties that you want to merge. It all must be arrays.
 * @returns The updated original array.
 */
function merge(firstArray, secondArray, keyProperty, objectPropertiesToMerge) {

    function mergeObjectProperties(object, otherObject, objectPropertiesToMerge) {
        _.each(objectPropertiesToMerge, function (eachProperty) {
            object[eachProperty] = _.chain(object[eachProperty]).union(otherObject[eachProperty]).compact().value();
        });
    }

    if (firstArray.length === 0) {
        _.each(secondArray, function (each) {
            firstArray.push(each);
        });
    } else {
        _.each(secondArray, function (itemFromSecond) {
            var itemFromFirst = _.find(firstArray, function (item) {
                return item[keyProperty] === itemFromSecond[keyProperty];
            });

            if (itemFromFirst) {
                mergeObjectProperties(itemFromFirst, itemFromSecond, objectPropertiesToMerge);
            } else {
                firstArray.push(itemFromSecond);
            }
    });
    }

    return firstArray;
}

_.mixin({
            merge: merge
        });

希望它有用！问候！

最近，我为这个问题感到难过，我带着希望的答案来到这里，但是被接受的答案使用2代表in in loops，这是我不希望的。我终于设法使自己的。完全不依赖任何库：

function find(objArr, keyToFind){
    var foundPos = objArr.map(function(ob){
        return ob.type;
    }).indexOf(keyToFind);
    return foundPos;
}

function update(arr1,arr2){
    for(var i = 0, len = arr2.length, current; i< len; i++){
        var pos = find(arr1, arr2[i].name); 
        current = arr2[i];
        if(pos !== -1) for(var key in arr2) arr1[pos][key] = arr2[key];
        else arr1[arr1.length] = current;
    } 
}

这也保持了arr1的顺序。

您可以使用以下功能

const merge = (a, b, key = "id") =>
  a.filter(elem => !b.find(subElem => subElem[key] === elem[key]))
   .concat(b);

并尝试

merge(arr1, arr2, 'name');

在这里，我首先arr1根据是否存在元素进行过滤arr2。如果存在，则不要将其添加到结果数组中，否则请添加。然后我附加arr2到结果中。

arr1.filter(item => {
  if (!arr2.some(item1=>item.name==item1.name)) {
    return item
  }
}).concat(arr2)

不在我的头上-尝试扩展jQuery

var arr3 = jQuery.extend(arr1,arr2....)

var newArray = yourArray.concat(otherArray); console.log('Concatenated newArray: ', newArray);

基于@YOU的答案，但保持顺序：

var arr3 = [];
for(var i in arr1){
   var shared = false;
   for (var j in arr2)
       if (arr2[j].name == arr1[i].name) {
           arr3.push(arr1[j]
           shared = true;
           break;
       }
   if(!shared) arr3.push(arr1[i])
}

for(var j in arr2){
   var shared = false;
   for (var i in arr1)
       if (arr2[j].name == arr1[i].name) {
           shared = true;
           break;
       }
   if(!shared) arr3.push(arr2[j])
}
arr3

我知道此解决方案的效率较低，但是如果您想保留订单并仍然更新对象，则必须这样做。

这是我编写的jQuery插件，用于通过键合并两个对象数组。请记住，这将就地修改目标数组。

(function($) {
  $.extendObjectArray = function(destArray, srcArray, key) {
    for (var index = 0; index < srcArray.length; index++) {
      var srcObject = srcArray[index];
      var existObject = destArray.filter(function(destObj) {
        return destObj[key] === srcObject[key];
      });
      if (existObject.length > 0) {
        var existingIndex = destArray.indexOf(existObject[0]);
        $.extend(true, destArray[existingIndex], srcObject);
      } else {
        destArray.push(srcObject);
      }
    }
    return destArray;
  };
})(jQuery);

var arr1 = [
  { name: "lang",   value: "English" },
  { name: "age",    value: "18"      }
];
var arr2 = [
  { name: "childs", value: '5'       },
  { name: "lang",   value: "German"  }
];
var arr3 = $.extendObjectArray(arr1, arr2, 'name');

console.log(JSON.stringify(arr3, null, 2));

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

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

ES6版本

(function($) {
  $.extendObjectArray = (destArr, srcArr, key) => {
    srcArr.forEach(srcObj => (existObj => {
      if (existObj.length) {
        $.extend(true, destArr[destArr.indexOf(existObj[0])], srcObj);
      } else {
        destArr.push(srcObj);
      }
    })(destArr.filter(v => v[key] === srcObj[key])));
    return destArr;
  };
})(jQuery);

使用lodash你想要_.uniqBy

var arr3 = _.uniqBy(arr1.concat(arr2), 'name'); // es5

let arr3 = _.uniqBy([...arr1, ...arr2], 'name'); // es6

arr1，arr2的顺序很重要！

参见docs https://lodash.com/docs/4.17.4#uniqBy

const extend = function*(ls,xs){
   yield* ls;
   yield* xs;
}

console.log( [...extend([1,2,3],[4,5,6])]  );

merge(a, b, key) {
    let merged = [];
    a.forEach(aitem => {
        let found = b.find( bitem => aitem[key] === bitem[key]);
        merged.push(found? found: aitem);
    });
    return merged;
}

如果要合并2个数组，但要删除重复的对象，请使用此方法。在.uniqueId每个对象上标识重复项

function mergeObjectArraysRemovingDuplicates(firstObjectArray, secondObjectArray) {
  return firstObjectArray.concat(
    secondObjectArray.filter((object) => !firstObjectArray.map((x) => x.uniqueId).includes(object.uniqueId)),
  );
}

试试这个：

var a = [{"a":20, "b":10,"c":"c","d":"asd","f":"any"}]
var b = [{"a":20, "b":10,"c":"c", "e":"nan","g":10200}]

var p = []
_.map(a, function(da){
var chk = _.filter(b, function(ds){
return da.a ===ds.a
})[0]
p.push(_.extend(da, chk))


})

console.log(p)

输出将是：

  [{
    "a": 20,
    "b": 10,
    "c": "c",
    "d": "asd",
    "f": "any",
    "e": "nan",
    "g": 10200
  }]

const arr1 = ["Vijendra","Singh"];
const arr2 = ["Singh", "Shakya"];

arr2.forEach(item => {
        if(!arr1.find(k => k===item))
          arr1.push(item)
    });


console.log(arr1)

利用JS Map的解决方案：

const merge = (arr1, arr2, prop) => {
    const resultMap = new Map([...arr1.map((item) => [item[prop], item])]);
    arr2.forEach((item) => {
        const mapItem = resultMap.get(item[prop]);
        if (mapItem) Object.assign(mapItem, item);
        else resultMap.set(item[prop], item);
    });
    return [...resultMap.values()];
};

const arr1 = new Array({name: "lang", value: "English"}, {name: "age", value: "18"});
const arr2 = new Array({name : "childs", value: '5'}, {name: "lang", value: "German"});

console.log(merge(arr1, arr2, "name"));

产生：

const array1 = [{id:1,name:'ganza'},
{id:2,name:'respice dddd'},{id:4,name:'respice dddd'},{id:6,name:'respice dddd'},
{id:7,name:'respice dddd'}];
const array2 = [{id:1,name:'ganza respice'},{id:2,name:'respice'},{id:3,name:'mg'}];

 function mergeTwoArray(array1,array2){

    return array1.map((item,i)=>{
        if(array2[i] && item.id===array2[i].id){
          return array2[i];
          }else{
            return item;
          }
    });
  }

const result = merge(array1,array2);
console.log(result);
//here is the result:  Array [Object { id: 1, name: "ganza respice" }, Object { id: 2, name: "respice" }, Object { id: 4, name: "respice dddd" }, Object { id: 6, name: "respice dddd" }, Object { id: 7, name: "respice dddd" }]