拷贝自定义类型的实例 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 copie...
newObj[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 { newT...
return (cons === 'Array' || cons === 'Object') }// 实现深度拷贝 Array/Objectfunction deepClone(oldObj) { if(typeTrue(oldObj)) { var newObj = oldObj.constructor() for(let i in oldObj) { if (oldObj.hasOwnProperty(i)) { newObj[i] = typeTrue(oldObj[i]) ? deepClone(oldObj...
javascript 求最大前5个数; 对象 深拷贝 deep copy * 用数组1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 function getTopN(a, n) {function _cloneArray(aa) { var n = aa.length, a = new Array...
let arrayCopy = [...array](Shallow copy) let copyArr = arr.slice() 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) ...
首先我们要实现一个getType函数对元素进行类型判断,直接调用Object.prototype.toString 方法。 functiongetType(obj){letmap={"[object Boolean]":"boolean","[object Number]":"number","[object String]":"string","[object Function]":"function","[object Array]":"array","[object Date]":"date","[obje...
== 'object' || obj === null) { return obj; } let copy = {}; // 如果对象是数组 if (obj.constructor === Array) { copy = []; } // 遍历对象的每个属性 for (let k in obj) { // 如果 key 是对象的自有属性 if (obj.hasOwnProperty(k)) { // 递归调用 deepClone copy[k] =...
constregexpTag='[object RegExp]'functiondeepClone(value,stack=newWeakMap()){if(!isObject(value)){returnvalue}letresult=Array.isArray(value)?[]:{}// 函数直接返回if(typeofvalue==='function'){returnvalue}// 处理引用类型的拷贝result=initCloneByTag(value,getTag(value))// 处理循环引用if(stack...
实际上是一种浅复制 (shallow-copy),所有嵌套的对象和数组都是直接复制引用而并没有进行深复制。源码: // Create a (shallow-cloned) duplicate of an object. _.clone = function(obj) { if (!_.isObject(obj)) return obj; return _.isArray(obj) ? obj.slice() : _.extend({}, obj); ...
function deepClone(obj = {}) { if (typeof obj !== 'object' || obj == null) { // obj 是 null ,或者不是对象和数组,直接返回 return obj } // 初始化返回结果 let result if (obj instanceof Array) { result = [] } else { ...