function clone(src, deep) {

    var toString = Object.prototype.toString;
    if(!src && typeof src != "object"){
        //any non-object ( Boolean, String, Number ), null, undefined, NaN
        return src;
    }

    //Honor native/custom clone methods
    if(src.clone && toString.call(src.clone) == "[object Function]"){
        return src.clone(deep);
    }

    //DOM Elements
    if(src.nodeType && toString.call(src.cloneNode) == "[object Function]"){
        return src.cloneNode(deep);
    }

    //Date
    if(toString.call(src) == "[object Date]"){
        return new Date(src.getTime());
    }

    //RegExp
    if(toString.call(src) == "[object RegExp]"){
        return new RegExp(src);
    }

    //Function
    if(toString.call(src) == "[object Function]"){
        //Wrap in another method to make sure == is not true;
        //Note: Huge performance issue due to closures, comment this :)
        return (function(){
            src.apply(this, arguments);
        });

    }

    var ret, index;
    //Array
    if(toString.call(src) == "[object Array]"){
        //[].slice(0) would soft clone
        ret = src.slice();
        if(deep){
            index = ret.length;
            while(index--){
                ret[index] = clone(ret[index], true);
            }
        }
    }
    //Object
    else {
        ret = src.constructor ? new src.constructor() : {};
        for (var prop in src) {
            ret[prop] = deep
                ? clone(src[prop], true)
                : src[prop];
        }
    }

    return ret;
};

根据Apple JavaScript编码指南：

// Create an inner object with a variable x whose default
// value is 3.
function innerObj()
{
        this.x = 3;
}
innerObj.prototype.clone = function() {
    var temp = new innerObj();
    for (myvar in this) {
        // this object does not contain any objects, so
        // use the lightweight copy code.
        temp[myvar] = this[myvar];
    }
    return temp;
}

// Create an outer object with a variable y whose default
// value is 77.
function outerObj()
{
        // The outer object contains an inner object.  Allocate it here.
        this.inner = new innerObj();
        this.y = 77;
}
outerObj.prototype.clone = function() {
    var temp = new outerObj();
    for (myvar in this) {
        if (this[myvar].clone) {
            // This variable contains an object with a
            // clone operator.  Call it to create a copy.
            temp[myvar] = this[myvar].clone();
        } else {
            // This variable contains a scalar value,
            // a string value, or an object with no
            // clone function.  Assign it directly.
            temp[myvar] = this[myvar];
        }
    }
    return temp;
}

// Allocate an outer object and assign non-default values to variables in
// both the outer and inner objects.
outer = new outerObj;
outer.inner.x = 4;
outer.y = 16;

// Clone the outer object (which, in turn, clones the inner object).
newouter = outer.clone();

// Verify that both values were copied.
alert('inner x is '+newouter.inner.x); // prints 4
alert('y is '+newouter.y); // prints 16

史蒂夫

根据Airbnb JavaScript风格指南，有404位贡献者：

首选对象排列运算符而不是对象。指定为浅层复制物体。使用object rest操作符获取具有特定省略了财产。

// very bad
const original = { a: 1, b: 2 };
const copy = Object.assign(original, { c: 3 }); // this mutates `original` ಠ_ಠ
delete copy.a; // so does this

// bad
const original = { a: 1, b: 2 };
const copy = Object.assign({}, original, { c: 3 }); // copy => { a: 1, b: 2, c: 3 }

// good
const original = { a: 1, b: 2 };
const copy = { ...original, c: 3 }; // copy => { a: 1, b: 2, c: 3 }

const { a, ...noA } = copy; // noA => { b: 2, c: 3 }

此外，我想提醒您，尽管Airbnb几乎不建议使用对象扩散运算符方法。请记住，Microsoft Edge仍然不支持此2018功能。

ES2016+公司表>>

如果您的对象是类（例如。https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes):

var copiedObject = jQuery.extend(true, {}, originalObject);
copiedObject.__proto__ = originalObject.__proto__;

然后在copiedObject中，您有一个originalObject类及其所有方法的深度复制实例。

您可以在不修改父对象的情况下克隆对象-

    /** [Object Extend]*/
    ( typeof Object.extend === 'function' ? undefined : ( Object.extend = function ( destination, source ) {
        for ( var property in source )
            destination[property] = source[property];
        return destination;
    } ) );
    /** [/Object Extend]*/
    /** [Object clone]*/
    ( typeof Object.clone === 'function' ? undefined : ( Object.clone = function ( object ) {
        return this.extend( {}, object );
    } ) );
    /** [/Object clone]*/

    let myObj = {
        a:1, b:2, c:3, d:{
            a:1, b:2, c:3
        }
    };

    let clone = Object.clone( myObj );

    clone.a = 10;

    console.log('clone.a==>', clone.a); //==> 10

    console.log('myObj.a==>', myObj.a); //==> 1 // object not modified here

    let clone2 = Object.clone( clone );

    clone2.a = 20;

    console.log('clone2.a==>', clone2.a); //==> 20

    console.log('clone.a==>', clone.a); //==> 10 // object not modified here

您可以使用函数闭包来获得深度复制的所有好处，而无需深度复制。这是一个非常不同的范例，但效果很好。不要试图复制现有对象，只要在需要时使用函数实例化新对象即可。

首先，创建一个返回对象的函数

function template() {
  return {
    values: [1, 2, 3],
    nest: {x: {a: "a", b: "b"}, y: 100}
  };
}

然后创建一个简单的浅层复制函数

function copy(a, b) {
  Object.keys(b).forEach(function(key) {
    a[key] = b[key];
  });
}

创建一个新对象，并将模板的财产复制到其中

var newObject = {}; 
copy(newObject, template());

但上述复制步骤不是必需的。您需要做的就是：

var newObject = template();

现在您有了一个新对象，请测试它的财产：

console.log(Object.keys(newObject));

这将显示：

["values", "nest"]

是的，这些是newObject自己的财产，而不是对另一个对象上财产的引用。让我们检查一下：

console.log(newObject.nest.x.b);

这将显示：

"b"

newObject获得了模板对象的所有财产，但没有任何依赖链。

http://jsbin.com/ISUTIpoC/1/edit?js安慰

我添加此示例是为了鼓励一些讨论，因此请添加一些评论：）