简单的深拷贝也可以通过 JSON序列化和反序列化来实现,但这种方法有一些限制,如无法拷贝函数和undefined等特殊值。 javascript 复制代码 const original = { a: 1, b: { c: 2 } }; const deepCopy = JSON.parse(JSON.stringify(original)); deepCopy.b.c = 3; console.log(original.b.c); // 2,深...
你不能使用 JSON.stringify 和 JSON.parse 来拷贝自定义类型的数据,下面的例子使用一个自定义的 copy() 方法: class Counter { constructor() {this.count = 5} copy() { const copy=newCounter() copy.count=this.countreturncopy } } const originalCounter=newCounter() const copiedCounter=originalCounter...
copy = Object.create(Object.getPrototypeOf(obj));hash.set(obj, copy);for (let key in obj) {...
5. 使用jQuery中的extend函数 // Shallow copyjQuery.extend({},OriginalObject)// Deep copy jQuery.extend(true, {},OriginalObject) jQuery.extend( [deep ], target, object1 [, objectN ] ),其中deep为Boolean类型,如果是true,则进行深拷贝。 var $ = require('jquery')var o1 = { a : 1, b :...
deep =false;// Handle a deep copy situation 处理深拷贝if(typeoftarget ==="boolean") { deep = target;// Skip the boolean and the target// 跳过布尔和目标,重新赋值targettarget =arguments[ i ] || {}; i++; }// Handle case when target is a string or something (possible in deep copy...
In JavaScript, all standard built-in object-copy operations (spread syntax,Array.prototype.concat(),Array.prototype.slice(),Array.from(),Object.assign(), andObject.create()) create shallow copies rather than deep copies. Adeep copyof an object is a copy whose properties donot share the same...
constlodashClonedeep=require("lodash.clonedeep");constarrOfFunction=[()=>2,{test:()=>3,},Symbol('4')];// deepClone copy by refence function and Symbolconsole.log(lodashClonedeep(arrOfFunction));// JSON replace function with null and function in object with undefinedconsole.log(JSON.parse...
A very common way to create a "copy" of an Object in JavaScript is to copy all things from one object into an empty one. Example: constoriginal = {foo:"Foo"}constcopy =Object.assign({}, original) copy.foo="Bar"console.log([original.foo, copy.foo]) ...
The figure below illustrates the Deep Copy, 2) Shallow Copy The shallow copy method of copying contents is a technique in which the changes made in the copied object are reflected in the original object. This shows that the new object copy created and the original object share the same memor...
There are likely more, but I've got 8 approaches for creating a shallow copy of a JavaScript array. Let's dive right in! FYI: A shallow copy means that we do not make copies of deeply nested objects. So if an element of an array is an object, we only copy over its reference. We...