这通常不是最有效的解决方案,但它是我需要的。

function clone(obj, clones) {
    // Makes a deep copy of 'obj'. Handles cyclic structures by
    // tracking cloned obj's in the 'clones' parameter. Functions 
    // are included, but not cloned. Functions members are cloned.
    var new_obj,
        already_cloned,
        t = typeof obj,
        i = 0,
        l,
        pair; 

    clones = clones || [];

    if (obj === null) {
        return obj;
    }

    if (t === "object" || t === "function") {

        // check to see if we've already cloned obj
        for (i = 0, l = clones.length; i < l; i++) {
            pair = clones[i];
            if (pair[0] === obj) {
                already_cloned = pair[1];
                break;
            }
        }

        if (already_cloned) {
            return already_cloned; 
        } else {
            if (t === "object") { // create new object
                new_obj = new obj.constructor();
            } else { // Just use functions as is
                new_obj = obj;
            }

            clones.push([obj, new_obj]); // keep track of objects we've cloned

            for (key in obj) { // clone object members
                if (obj.hasOwnProperty(key)) {
                    new_obj[key] = clone(obj[key], clones);
                }
            }
        }
    }
    return new_obj || obj;
}

自行车测试...

a = []
a.push("b", "c", a)
aa = clone(a)
aa === a //=> false
aa[2] === a //=> false
aa[2] === a[2] //=> false
aa[2] === aa //=> true

功能测试...

f = new Function
f.a = a
ff = clone(f)
ff === f //=> true
ff.a === a //=> false

这是一个回归的解决方案:

obj = { a: { b: { c: { d: ['1', '2'] } } }, e: 'Saeid' } const Clone = function (obj) { const container = Array.isArray(obj) ? [] : {} const keys = Object.keys(obj) for (let i = 0; i < keys.length; i++) { const key = keys[i] if(typeof obj[key] == 'object') { container[key] = Clone(obj[key]) } else container[key] = obj[key].slice() } return container } console.log(Clone(obj))

假设您只拥有属性,而不是对象中的任何功能,您只能使用:

var newObject = JSON.parse(JSON.stringify(oldObject));

以下是 ConroyP 上面的答案的版本,即使制造商需要参数:

//If Object.create isn't already defined, we just do the simple shim,
//without the second argument, since that's all we need here
var object_create = Object.create;
if (typeof object_create !== 'function') {
    object_create = function(o) {
        function F() {}
        F.prototype = o;
        return new F();
    };
}

function deepCopy(obj) {
    if(obj == null || typeof(obj) !== 'object'){
        return obj;
    }
    //make sure the returned object has the same prototype as the original
    var ret = object_create(obj.constructor.prototype);
    for(var key in obj){
        ret[key] = deepCopy(obj[key]);
    }
    return ret;
}

此功能也在我的 simpleoo 图书馆中可用。

编辑:

下面是一个更坚实的版本(感谢Justin McCandless,现在支持自行车参考):

/**
 * Deep copy an object (make copies of all its object properties, sub-properties, etc.)
 * An improved version of http://keithdevens.com/weblog/archive/2007/Jun/07/javascript.clone
 * that doesn't break if the constructor has required parameters
 * 
 * It also borrows some code from http://stackoverflow.com/a/11621004/560114
 */ 
function deepCopy(src, /* INTERNAL */ _visited, _copiesVisited) {
    if(src === null || typeof(src) !== 'object'){
        return src;
    }

    //Honor native/custom clone methods
    if(typeof src.clone == 'function'){
        return src.clone(true);
    }

    //Special cases:
    //Date
    if(src instanceof Date){
        return new Date(src.getTime());
    }
    //RegExp
    if(src instanceof RegExp){
        return new RegExp(src);
    }
    //DOM Element
    if(src.nodeType && typeof src.cloneNode == 'function'){
        return src.cloneNode(true);
    }

    // Initialize the visited objects arrays if needed.
    // This is used to detect cyclic references.
    if (_visited === undefined){
        _visited = [];
        _copiesVisited = [];
    }

    // Check if this object has already been visited
    var i, len = _visited.length;
    for (i = 0; i < len; i++) {
        // If so, get the copy we already made
        if (src === _visited[i]) {
            return _copiesVisited[i];
        }
    }

    //Array
    if (Object.prototype.toString.call(src) == '[object Array]') {
        //[].slice() by itself would soft clone
        var ret = src.slice();

        //add it to the visited array
        _visited.push(src);
        _copiesVisited.push(ret);

        var i = ret.length;
        while (i--) {
            ret[i] = deepCopy(ret[i], _visited, _copiesVisited);
        }
        return ret;
    }

    //If we've reached here, we have a regular object

    //make sure the returned object has the same prototype as the original
    var proto = (Object.getPrototypeOf ? Object.getPrototypeOf(src): src.__proto__);
    if (!proto) {
        proto = src.constructor.prototype; //this line would probably only be reached by very old browsers 
    }
    var dest = object_create(proto);

    //add this object to the visited array
    _visited.push(src);
    _copiesVisited.push(dest);

    for (var key in src) {
        //Note: this does NOT preserve ES5 property attributes like 'writable', 'enumerable', etc.
        //For an example of how this could be modified to do so, see the singleMixin() function
        dest[key] = deepCopy(src[key], _visited, _copiesVisited);
    }
    return dest;
}

//If Object.create isn't already defined, we just do the simple shim,
//without the second argument, since that's all we need here
var object_create = Object.create;
if (typeof object_create !== 'function') {
    object_create = function(o) {
        function F() {}
        F.prototype = o;
        return new F();
    };
}

这是我正在使用的:

function cloneObject(obj) {
    var clone = {};
    for(var i in obj) {
        if(typeof(obj[i])=="object" && obj[i] != null)
            clone[i] = cloneObject(obj[i]);
        else
            clone[i] = obj[i];
    }
    return clone;
}

下面是同一个对象的两个例子,我发现了它,目前正在使用它,它很简单,易于使用。

var objToCreate = JSON.parse(JSON.stringify(cloneThis));