javascript 复制代码 function deepClone(obj, hash = new WeakMap()) { if (obj === null || typeof obj !== 'object') { return obj; } if (hash.has(obj)) { return hash.get(obj); } const copy = Array.isArray(obj) ? [] : {}; hash.set(obj, copy); for (const key in obj...
var shallow = _.clone(objects);console.log(shallow[0] === objects[0]); // trueobjects[0].a = 11console.log(shallow[0]) // { a : 11} DeepCopy深拷贝的实现方式 1. 手动复制 要实现拷贝出来的副本,不受原本影响,那么可以这么实现 var o1 = { a : 1, b : 2 }var o2 = { a : o...
Unfortunately, all of these create shallow copies, not deep ones.Shallow cloning in JavaScript # With a shallow copy, the original array or object is a unique copy, but any arrays or objects contained within it are actually just references to the original....
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...
[key] = everyArray(obj[key]) } else { newObj[key] = obj[key] } } return newObj } const deepCopy = (target) => { var newTarget = null if (isObject(target)) { newTarget = everyObject(target) } else if (isArray(target)) { newTarget = everyArray(target) } else { newTarget...
### 基础概念 在React中,深拷贝(deep copy)指的是创建一个新对象或数组,并将原始对象或数组的所有嵌套属性和元素复制到新对象或数组中。这样,修改新对象或数组不会影响原始对象或数组。 ...
copy = options[ name ];// Prevent never-ending loop// 防止无限循环if( target === copy ) {continue; }// Recurse if we're merging plain objects or arrays// 如果要合并纯对象或数组,使用递归if( deep && copy && ( jQuery.isPlainObject( copy ) || ( copyIsArray =Array.isArray( copy )...
const myDeepCopy = JSON.parse(JSON.stringify(myOriginal));JavaScript In fact, its popularity made the V8 engine optimize JSON.parse for making the above statement execute faster. While it works amazingly well, there are a couple of shortcomings of that method: It cannot handle objec...
A way to create a shallow copy in JavaScript using theobject spread operator const myOriginal = { someProp: "with a string value", anotherProp: { withAnotherProp: 1, andAnotherProp: true } }; const myShallowCopy = {...myOriginal}; ...
How to copy objects The Secret of Object Inheritance - Prototypes Nine methods of inheritance properties and methods JavaScript objects can inherit properties from an object called a prototype. Object methods are usually inherited properties. This "prototypal inheritance" is a core feature of JavaScript...