console.log(originalCounter.count)//5console.log(copiedCounter.count)//5copiedCounter.count = 7console.log(originalCounter.count)//5console.log(copiedCounter.count)//7 如果实例中有其它对象的引用,就要在copy方法中使用 JSON.stringify 和 JSON.parse 。 除此之外,深拷贝方法还有jQuery.extend()和lodash....
value){if(!copy)copy=deepCopy(obj);returnReflect.set(copy,property,value);}};returnnewProxy(obj...
value){if(!copy)copy=deepCopy(obj);returnReflect.set(copy,property,value);}};returnnewProxy(obj...
jQuery.extend( [deep ], target, object1 [, objectN ] ),其中deep为Boolean类型,如果是true,则进行深拷贝。 // jQuery.extend()源码jQuery.extend = jQuery.fn.extend = function() { var options, name, src, copy, copyIsArray, clone, target = arguments[ 0 ] || {}, // 定义变量,获取第一...
深拷贝DeepCopy,复制出一个全新的对象实例,新对象跟原对象不共享内存,两者操作互不影响。 简单点区分, 浅拷贝拷贝引用; 深拷贝拷贝实例。 ShallowCopy浅拷贝的实现方式 1. 赋值 先来说说,简单的赋值情况, varo1 = { a :1, b :2}varo2 = o1console.log(o2 === o1)// trueo1.a=2console.log(o1)/...
let copyArr = Object.assign([], arr) ✅Works for one-dimensioned array. ❌Won't work for nested array. let arrayCopy = JSON.parse(JSON.stringify(nestedArray));(Deep copy) ✅ Only work withNumber and String and Object literalwithout function or Symbol properties. ...
JavaScript - Shallow Copy - In JavaScript, a shallow copy is a duplication of an array or object that replicates its top-level elements, but not its nested structures. When creating a shallow copy of an array, common methods include using the spread oper
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...
Deep Copy A deep copy creates a new object and recursively adds the copies of nested objects present in the original elements. Let’s continue with example 2. However, we are going to create deep copy usingdeepcopy()function present incopymodule. The deep copy creates independent copy of orig...
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]) ...