getOwnPropertyDescriptor(obj, name); Object.defineProperty(copy, name, desc); }); return copy; } var obj1 = { a: 1, b: {bc: 50, dc: 100, be: {bea: 1}} }; var obj2 = deepCopy(obj1); console.log(obj2) obj1.a = 20; console.log(obj1) console.log(obj2) //Object {a...
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....
Copying a value in JavaScript is almost a shallow copy, not a deep copy. This means that changes to deeply nested values will be visible in both the copy and the original. A way to create a shallow copy in JavaScript using theobject spread operator const myOriginal = { someProp: "with ...
For as long as anyone can remember, deep copying in JavaScript was not a built-in feature and we had to resort to libraries or workarounds to create a deep copy of a JavaScript value. That has changed now. The platform now offers a built-in function that does deep copying f...
浅拷贝ShallowCopy,是一个对象的逐位副本。创建一个新对象,该对象具有原始对象中的精确副本。如果对象的任何字段是对其他对象的引用,则只复制引用地址,即只复制内存地址,而不复制对象本身,新旧对象还是共享同一块堆内存。改变其中一个对象,另一个也会受影响。如果有修改,会失去原始数据。
今天给大家推荐的工具是deepcopy,一个可以对指针、接口、切片、结构体、Map都能进行深拷贝的工具。在Go中需要对一个变量进行拷贝时分浅拷贝和深拷贝。浅拷贝就是拷贝后就是无论改变新值还是原值都对对另一个产生影响,比如切片。而深拷贝则是将目标值完全拷贝一份,消除这种影响。 实现原理分析:深拷贝的实现原理本质...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 constdeepClone=(target)=>{// 如果是 值类型 或 null ,直接返回if(typeoftarget!=='object'||target===null){returntarget;}constcopy=Array.isArray(target)?[]:{};for(letpropintarget){if(target.hasOwnProperty(prop)){copy[prop]=deepClone(tar...
copy[prop] =deepClone(target[prop]); } }returncopy; } 解决循环引用 letobj = {val:2}; obj.target= obj;deepClone(obj);// 报错: RangeError: Maximum call stack size exceeded 思路:创建一个 Map ,记录已经被拷贝的对象,遇到已经拷贝的对象,直接返回。
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...
(let key in obj) { if (isObject(obj[key])) { newObj[key] = everyObject(obj[key]) } else if (isArray(obj[key])) { newObj[key] = everyArray(obj[key]) } else { newObj[key] = obj[key] } } return newObj } const deepCopy = (target) => { var newTarget = null if (is...