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86 lines
1.4 KiB
Markdown
86 lines
1.4 KiB
Markdown
---
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id: 596a8888ab7c01048de257d5
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title: 深度拷贝
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challengeType: 1
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forumTopicId: 302247
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dashedName: deepcopy
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---
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# --description--
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Write a function that returns a deep copy of a given object. The copy must not be the same object that was given.
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此任务不会测试：
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<ul>
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<li>Objects with properties that are functions</li>
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<li>Date 对象或具有 Date 对象属性的对象</li>
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<li>RegEx 或具有作为 RegEx 对象的属性的对象</li>
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<li>原型复制</li>
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</ul>
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# --hints--
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`deepcopy` 应该是一个函数。
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```js
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assert(typeof deepcopy === 'function');
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```
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`deepcopy({test: "test"})` 应该返回一个对象。
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```js
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assert(typeof deepcopy(obj1) === 'object');
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```
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`deepcopy` 不应返回与提供的相同对象。
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```js
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assert(deepcopy(obj2) != obj2);
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```
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当传递一个包含数组的对象时，`deepcopy` 应该返回该对象的深层副本。
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```js
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assert.deepEqual(deepcopy(obj2), obj2);
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```
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当传递包含另一个对象的对象时，`deepcopy` 应返回该对象的深层副本。
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```js
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assert.deepEqual(deepcopy(obj3), obj3);
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```
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# --seed--
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## --after-user-code--
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```js
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const obj1 = { test: 'test' };
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const obj2 = {
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t: 'test',
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a: ['an', 'array']
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};
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const obj3 = {
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t: 'try',
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o: obj2
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};
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```
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## --seed-contents--
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```js
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function deepcopy(obj) {
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return true;
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}
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```
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# --solutions--
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```js
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function deepcopy(obj) {
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return JSON.parse(JSON.stringify(obj));
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}
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```
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