function clone(obj)
 { var clone = {};
   clone.prototype = obj.prototype;
   for (property in obj) clone[property] = obj[property];
   return clone;
 }

使用 Object.create() 获取原型和支持的例子,并使用 for() 圈获取可列的密钥:

function cloneObject(source) {
    var key,value;
    var clone = Object.create(source);

    for (key in source) {
        if (source.hasOwnProperty(key) === true) {
            value = source[key];

            if (value!==null && typeof value==="object") {
                clone[key] = cloneObject(value);
            } else {
                clone[key] = value;
            }
        }
    }

    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));

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();
    };
}

使用今天的JavaScript来克隆一个对象:ECMAScript 2015(以前被称为ECMAScript 6)

var original = {a: 1};

// Method 1: New object with original assigned.
var copy1 = Object.assign({}, original);

// Method 2: New object with spread operator assignment.
var copy2 = {...original};

旧浏览器可能不支持 ECMAScript 2015. 一个常见的解决方案是使用 JavaScript-to-JavaScript 编译器,如 Babel 发行您的 JavaScript 代码的 ECMAScript 5 版本。

正如 @jim-hall 指出的那样,这只是一个微小的副本. 属性属性被复制为参考:更改一个将改变另一个对象/实例的值。

下面是我如何深度克隆一个与ES2015默认值和扩展操作器的对象

 const makeDeepCopy = (obj, copy = {}) => {
  for (let item in obj) {
    if (typeof obj[item] === 'object') {
      makeDeepCopy(obj[item], copy)
    }
    if (obj.hasOwnProperty(item)) {
      copy = {
        ...obj
      }
    }
  }
  return copy
}

const testObj = {“类型”:“对象”,“属性”: {“用户Id”: {“类型”:“string”,“机会”:“指南” },“emailAddr”: {“类型”:“string”,“机会”: {“电子邮件”: {“域名”:“fake.com” },“模式”:“+@fake.com” },“需要”: {“用户Id”,“emailAddr” } } const makeDeepCopy = (ob)