1、JSON方法实现:
//_tmp和result是相互独立的,没有任何联系,有各自的存储空间。 let deepClone = function (obj) { let _tmp = JSON.stringify(obj);//将对象转换为json字符串形式 let result = JSON.parse(_tmp);//将转换而来的字符串转换为原生js对象 return result; }; let obj1 = { weiqiujaun: { age: 20, class: 1502 }, liuxiaotian: { age: 21, class: 1501 } }; let test = deepClone(obj1); console.log(test);
2、用for..in遍历
//_tmp和result是相互独立的,没有任何联系,有各自的存储空间。 let deepClone = function (obj) { let _tmp = JSON.stringify(obj);//将对象转换为json字符串形式 let result = JSON.parse(_tmp);//将转换而来的字符串转换为原生js对象 return result; }; let obj1 = { weiqiujaun: { age: 20, class: 1502 }, liuxiaotian: { age: 21, class: 1501 } }; let test = deepClone(obj1); console.log(test);
3、利用数组的Array.prototype.forEach进copy
let deepClone = function (obj) { let copy = Object.create(Object.getPrototypeOf(obj)); let propNames = Object.getOwnPropertyNames(obj); propNames.forEach(function (items) { let item = Object.getOwnPropertyDescriptor(obj, items); Object.defineProperty(copy, items, item); }); return copy; }; let testObj = { name: "weiqiujuan", sex: "girl", age: 22, favorite: "play", family: {brother: "wei", mother: "haha", father: "heihei"} } let testRes2 = deepClone(testObj); console.log(testRes2);
4、使用递归的方式实现深拷贝
/使用递归的方式实现数组、对象的深拷贝 function deepClone1(obj) { //判断拷贝的要进行深拷贝的是数组还是对象,是数组的话进行数组拷贝,对象的话进行对象拷贝 var objClone = Array.isArray(obj) ? [] : {}; //进行深拷贝的不能为空,并且是对象或者是 if (obj && typeof obj === "object") { for (key in obj) { if (obj.hasOwnProperty(key)) { if (obj[key] && typeof obj[key] === "object") { objClone[key] = deepClone1(obj[key]); } else { objClone[key] = obj[key]; } } } } return objClone; }
5、lodash函数库实现深拷贝
lodash很热门的函数库,提供了 lodash.cloneDeep()实现深拷贝