我需要能够在运行时合并两个(非常简单)JavaScript对象。例如,我想:

var obj1 = { food: 'pizza', car: 'ford' }
var obj2 = { animal: 'dog' }

obj1.merge(obj2);

//obj1 now has three properties: food, car, and animal

是否有一种内置的方法来实现这一点?我不需要递归,也不需要合并函数,只需要平面对象上的方法。


当前回答

有不同的方法可以实现这一点:

Object.assign(targetObj, sourceObj);

targetObj = {...targetObj, ...sourceObj};

其他回答

Use:

//Takes any number of objects and returns one merged object
var objectMerge = function(){
    var out = {};
    if(!arguments.length)
        return out;
    for(var i=0; i<arguments.length; i++) {
        for(var key in arguments[i]){
            out[key] = arguments[i][key];
        }
    }
    return out;
}

测试方法:

console.log(objectMerge({a:1, b:2}, {a:2, c:4}));

结果是:

{ a: 2, b: 2, c: 4 }

我们可以装箱一个空对象,并通过for循环将它们组合起来:

变量obj1={id:“1”,name:'name'}变量obj2={c: “c”,d: “d”}var obj3={}for(obj1中的var attrname){obj3[attrname]=obj1[attrname];}for(obj2中的var attrname){obj3[attrname]=obj2[attrname];}控制台日志(obj1、obj2、obj3)

最好的方法是使用Object.defineProperty添加一个不可枚举的适当属性。

通过这种方式,您仍然可以迭代对象财产,而无需使用Object.prototype.extend创建属性时新创建的“extend”。

希望这有助于:

Object.defineProperty(Object.prototype, "extend", {
    enumerable: false,
    value: function(from) {
        var props = Object.getOwnPropertyNames(from);
        var dest = this;
        props.forEach(function(name) {
            if (name in dest) {
                var destination = Object.getOwnPropertyDescriptor(from, name);
                Object.defineProperty(dest, name, destination);
            }
        });
        return this;
    }
});

一旦你做到了这一点,你就可以做到:

var obj = {
    name: 'stack',
    finish: 'overflow'
}
var replacement = {
    name: 'stock'
};

obj.extend(replacement);

我刚刚在这里写了一篇博文:http://onemoredigit.com/post/1527191998/extending-objects-in-node-js

var obj1 = { food: 'pizza', car: 'ford' }
var obj2 = { animal: 'dog' }

// result
result: {food: "pizza", car: "ford", animal: "dog"}

使用jQuery.exde()-Link

// Merge obj1 & obj2 to result
var result1 = $.extend( {}, obj1, obj2 );

使用_.merge()-链接

// Merge obj1 & obj2 to result
var result2 = _.merge( {}, obj1, obj2 );

使用_.exde()-链接

// Merge obj1 & obj2 to result
var result3 = _.extend( {}, obj1, obj2 );

使用Object.assign()ECMAScript 2015(ES6)-Link

// Merge obj1 & obj2 to result
var result4 = Object.assign( {}, obj1, obj2 );

全部输出

obj1: { animal: 'dog' }
obj2: { food: 'pizza', car: 'ford' }
result1: {food: "pizza", car: "ford", animal: "dog"}
result2: {food: "pizza", car: "ford", animal: "dog"}
result3: {food: "pizza", car: "ford", animal: "dog"}
result4: {food: "pizza", car: "ford", animal: "dog"}

使用jQuery库尝试这种方式

let obj1 = { food: 'pizza', car: 'ford' }
let obj2 = { animal: 'dog' }

console.log(jQuery.extend(obj1, obj2))