functiondeepClone(obj) {varcopy;// 如果 obj 是 null、undefined 或 不是对象,直接返回 obj// Handle the 3 simple types, and null or undefinedif(null== obj ||"object"!=typeofobj)returnobj;// Handle Dateif(objinstanceofDate) { copy =newDate(); copy.setTime(obj.getTime());returncopy;...
parent =Object.getPrototypeOf(parent) }// 下面这个函数会拷贝所有自有属性的属性描述符,来自于 MDN// https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/assignfunctioncompleteAssign(target, ...sources) { sources.forEach(source=>{letdescriptors =Object.keys(source)....
copy.setTime(obj.getTime()) return copy } // 处理数组 if (Array instanceof Array) { copy = [] for (var i = 0, len = obj.length; i < len; i++) { copy[i] = deepClone(obj[i]) } return copy } // 处理函数 if (obj instanceof Function) { copy = function() { return ob...
[] : {};for(letkeyinobj) {if(obj.hasOwnProperty(key)) {if(typeofobj[key] ==='object') { result[key] = deepCopy(obj[key]);// 递归复制}else{ result[key] = obj[key]; } } }returnresult; } lodash 的深拷贝 cloneDeep 使用lodash 插件的深拷贝方法 // 官方例子varobjects = [{'a...
const simpleEvent = { title: "Builder.io Conf",}// ✅ 可以，这里没有嵌套对象或者数组const shallowCopy = {...calendarEvent} 当然，开发者还可以使用下面 Object.assign 或者 Object.create 的方式：const shallowCopy = Object.assign({}, simpleEvent)const shallowCopy = Object.create(simpleEvent)...
copy;}// Handle Arrayif(objinstanceofArray){copy=[];for(vari=0,len=obj.length;i<len;i++){copy[i]=deepClone(obj[i]);}returncopy;}// Handle Functionif(objinstanceofFunction){copy=function(){returnobj.apply(this,arguments);}returncopy;}// Handle Objectif(objinstanceofObject){copy={}...
functiondeepCopy(obj){varnewobj=obj.constructor===Array?[]:{};if(typeofobj!=='object'){returnobj;}else{for(variinobj){if(typeofobj[i]==='object'){//判断对象的这条属性是否为对象newobj[i]=deepCopy(obj[i]);//若是对象进行嵌套调用}else{newobj[i]=obj[i];}}}returnnewobj;//返回深度...
在MDN给出primitive type定义的同时,还给出了Primitive wrapper objects的定义 Except for null and undefined, all primitive values have object equivalents that wrap around the >primitive values: String for the string primitive. Number for the number primitive. ...
i<length;i++){// 以下拷贝操作,只针对非 null 或 undefined 的 arguments[i] 进行if((options=arguments[i])!=null){// Extend the base objectfor(nameinoptions){src=target[name];copy=options[name];// 避免死循环的情况if(target===copy){continue;}// Recurse if we're merging plain objects...
// v8/src/objects/js-array.h 105// Number of element slots to pre-allocate for an empty array. (默认的空数组预分配的大小为 4)staticconstintkPreallocatedArrayElements=4;// v8/src/objects/js-objects.h 537staticconstuint32_tkMinAddedElementsCapacity=16;// v8/src/objects/js-objects.h 540...