我有一个对象x。我想将其复制为对象y,这样对y的更改不会修改x。我意识到复制从内置JavaScript对象派生的对象会导致额外的、不需要的财产。这不是问题,因为我正在复制我自己的一个文字构造对象。
如何正确克隆JavaScript对象?
我有一个对象x。我想将其复制为对象y,这样对y的更改不会修改x。我意识到复制从内置JavaScript对象派生的对象会导致额外的、不需要的财产。这不是问题,因为我正在复制我自己的一个文字构造对象。
如何正确克隆JavaScript对象?
当前回答
这将生成obj的新副本(而不仅仅是引用)。
let myCopy = JSON.parse(JSON.stringify(obj));
..比_.cloneDeep(obj)更有效。
其他回答
复制最终可能指向自身的对象的问题可以通过简单的检查来解决。每次有复制操作时,添加此复选框。它可能很慢,但应该会起作用。
我使用toType()函数显式返回对象类型。我也有自己的copyObj()函数,它在逻辑上非常相似,可以回答所有三种Object()、Array()和Date()情况。
我在NodeJS中运行它。
尚未测试。
// Returns true, if one of the parent's children is the target.
// This is useful, for avoiding copyObj() through an infinite loop!
function isChild(target, parent) {
if (toType(parent) == '[object Object]') {
for (var name in parent) {
var curProperty = parent[name];
// Direct child.
if (curProperty = target) return true;
// Check if target is a child of this property, and so on, recursively.
if (toType(curProperty) == '[object Object]' || toType(curProperty) == '[object Array]') {
if (isChild(target, curProperty)) return true;
}
}
} else if (toType(parent) == '[object Array]') {
for (var i=0; i < parent.length; i++) {
var curItem = parent[i];
// Direct child.
if (curItem = target) return true;
// Check if target is a child of this property, and so on, recursively.
if (toType(curItem) == '[object Object]' || toType(curItem) == '[object Array]') {
if (isChild(target, curItem)) return true;
}
}
}
return false; // Not the target.
}
这是对A.Levy代码的修改,以处理函数和多个/循环引用的克隆。这意味着,如果克隆的树中的两个财产是同一对象的引用,则克隆的对象树将使这些财产指向被引用对象的同一克隆。这也解决了循环依赖性的问题,如果不加以处理,就会导致无限循环。算法的复杂度为O(n)
function clone(obj){
var clonedObjectsArray = [];
var originalObjectsArray = []; //used to remove the unique ids when finished
var next_objid = 0;
function objectId(obj) {
if (obj == null) return null;
if (obj.__obj_id == undefined){
obj.__obj_id = next_objid++;
originalObjectsArray[obj.__obj_id] = obj;
}
return obj.__obj_id;
}
function cloneRecursive(obj) {
if (null == obj || typeof obj == "string" || typeof obj == "number" || typeof obj == "boolean") return obj;
// Handle Date
if (obj instanceof Date) {
var copy = new Date();
copy.setTime(obj.getTime());
return copy;
}
// Handle Array
if (obj instanceof Array) {
var copy = [];
for (var i = 0; i < obj.length; ++i) {
copy[i] = cloneRecursive(obj[i]);
}
return copy;
}
// Handle Object
if (obj instanceof Object) {
if (clonedObjectsArray[objectId(obj)] != undefined)
return clonedObjectsArray[objectId(obj)];
var copy;
if (obj instanceof Function)//Handle Function
copy = function(){return obj.apply(this, arguments);};
else
copy = {};
clonedObjectsArray[objectId(obj)] = copy;
for (var attr in obj)
if (attr != "__obj_id" && obj.hasOwnProperty(attr))
copy[attr] = cloneRecursive(obj[attr]);
return copy;
}
throw new Error("Unable to copy obj! Its type isn't supported.");
}
var cloneObj = cloneRecursive(obj);
//remove the unique ids
for (var i = 0; i < originalObjectsArray.length; i++)
{
delete originalObjectsArray[i].__obj_id;
};
return cloneObj;
}
一些快速测试
var auxobj = {
prop1 : "prop1 aux val",
prop2 : ["prop2 item1", "prop2 item2"]
};
var obj = new Object();
obj.prop1 = "prop1_value";
obj.prop2 = [auxobj, auxobj, "some extra val", undefined];
obj.nr = 3465;
obj.bool = true;
obj.f1 = function (){
this.prop1 = "prop1 val changed by f1";
};
objclone = clone(obj);
//some tests i've made
console.log("test number, boolean and string cloning: " + (objclone.prop1 == obj.prop1 && objclone.nr == obj.nr && objclone.bool == obj.bool));
objclone.f1();
console.log("test function cloning 1: " + (objclone.prop1 == 'prop1 val changed by f1'));
objclone.f1.prop = 'some prop';
console.log("test function cloning 2: " + (obj.f1.prop == undefined));
objclone.prop2[0].prop1 = "prop1 aux val NEW";
console.log("test multiple references cloning 1: " + (objclone.prop2[1].prop1 == objclone.prop2[0].prop1));
console.log("test multiple references cloning 2: " + (objclone.prop2[1].prop1 != obj.prop2[0].prop1));
在ECMAScript 6中有Object.assign方法,它将所有可枚举自身财产的值从一个对象复制到另一个对象。例如:
var x = {myProp: "value"};
var y = Object.assign({}, x);
但请注意,这是一个浅层复制-嵌套对象仍然作为引用复制。
本文来自Brian Huisman的《如何在Javascript中复制数组和对象》:
Object.prototype.clone = function() {
var newObj = (this instanceof Array) ? [] : {};
for (var i in this) {
if (i == 'clone') continue;
if (this[i] && typeof this[i] == "object") {
newObj[i] = this[i].clone();
} else newObj[i] = this[i]
} return newObj;
};
//
// creates 'clone' method on context object
//
// var
// clon = Object.clone( anyValue );
//
!((function (propertyName, definition) {
this[propertyName] = definition();
}).call(
Object,
"clone",
function () {
function isfn(fn) {
return typeof fn === "function";
}
function isobj(o) {
return o === Object(o);
}
function isarray(o) {
return Object.prototype.toString.call(o) === "[object Array]";
}
function fnclon(fn) {
return function () {
fn.apply(this, arguments);
};
}
function owns(obj, p) {
return obj.hasOwnProperty(p);
}
function isemptyobj(obj) {
for (var p in obj) {
return false;
}
return true;
}
function isObject(o) {
return Object.prototype.toString.call(o) === "[object Object]";
}
return function (input) {
if (isfn(input)) {
return fnclon(input);
} else if (isobj(input)) {
var cloned = {};
for (var p in input) {
owns(Object.prototype, p)
|| (
isfn(input[p])
&& ( cloned[p] = function () { return input[p].apply(input, arguments); } )
|| ( cloned[p] = input[p] )
);
}
if (isarray(input)) {
cloned.length = input.length;
"concat every filter forEach indexOf join lastIndexOf map pop push reduce reduceRight reverse shift slice some sort splice toLocaleString toString unshift"
.split(" ")
.forEach(
function (methodName) {
isfn( Array.prototype[methodName] )
&& (
cloned[methodName] =
function () {
return Array.prototype[methodName].apply(cloned, arguments);
}
);
}
);
}
return isemptyobj(cloned)
? (
isObject(input)
? cloned
: input
)
: cloned;
} else {
return input;
}
};
}
));
//