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...
Thus, we can use the JSON.parse() and JSON.stringify() methods to perform the deep copy of an object in JavaScript.But, we will have a problem when working with functions and objects. Let’s implement the deep clone of an object that contains a function and a Date() object to see ...
function deepClone(obj) { var target = {}; for(var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { // 如果obj有key这个属性的话 if (typeof obj[key] === 'object') { target[key] = deepClone(obj[key]); } else { target[key] = obj[key]; } } } return...
Before getting into deep copying, let us discuss what shallow copy is. The default behavior of copying in JavaScript is to shallow copy. That means that whenever we create a copy of something, changes to nested values in the original value will be reflected in the copied object as...
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,
}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。 constisObject= (target) => {return(typeoftarget ==='object'||typeoftarget ==='...
Use theObject.assign()To Shallow Clone an Object in JavaScript Theobject.assign()method assigns a shallow copy of the object to a new object variable. It takes two arguments: target and source. Thetargetis usually a pair of empty parenthesis used to represent the empty object in which to ...
1.下面的方法,是给Object的原型(prototype)添加深度复制方法(deep clone)。 1Object.prototype.clone =function() {2//Handle null or undefined or function3if(null==this|| "object" !=typeofthis)4returnthis;5//Handle the 3 simple types, Number and String and Boolean6if(thisinstanceofNumber ||th...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 functiondeepClone(obj){// 如果值 值类型 或 null ,直接返回if(typeofobj!=='object'||obj===null){returnobj;}letcopy={};// 如果对象是数组if(obj.constructor===Array){copy=[];}// 遍历对象的每个属性for(letkinobj){// 如果 key 是对象的...
JavaScript offers many ways to copy an object, but not all provide deep copy. Learn the most efficient way, and also find out all the options you haveUpdate 2022: just use structuredClone()Copying objects in JavaScript can be tricky. Some ways perform a shallow copy, which is the default...