const obj = { d: new Date(), u: undefined } obj => Object {date: Sat Dec 17 2016 22:48:56 GMT+0900 (JST), u: undefined} const copyObj = JSON.parse(JSON.stringify(obj)) => Object {date: "2016-12-17T13:48:56.350Z"}
![[JavaScript]色々なディープコピー - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/7039d8c0c6fcf5aa1e19356ec8459cf1a318db2e/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9JTVCSmF2YVNjcmlwdCU1RCVFOCU4OSVCMiVFMyU4MCU4NSVFMyU4MSVBQSVFMyU4MyU4NyVFMyU4MiVBMyVFMyU4MyVCQyVFMyU4MyU5NyVFMyU4MiVCMyVFMyU4MyU5NCVFMyU4MyVCQyZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1jbGlwPWVsbGlwc2lzJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9OTJmNjA0ZTQzNDUyZGE4YzVlZTc0MWE2MWM3NzhmMWI%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwa25ocl9fJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1lOTA3NjZiYmZhNmRjYzI1YzBiZDg0NWU3MWUwYjUyNg%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D84ad6aff019f85e338ca35d97ed29d02)
[JavaScript]色々なディープコピー - Qiita
const obj = { d: new Date(), u: undefined } obj => Object {date: Sat Dec 17 2016 22:48:56 GMT+0900 (JST), u: undefined} const copyObj = JSON.parse(JSON.stringify(obj)) => Object {date: "2016-12-17T13:48:56.350Z"}
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