console.log(Number.MAX_SAFE_INTEGER); // 9007199254740991 console.log(Math.pow(2, 53) - 1); // 9007199254740991 console.log(Math.pow(2, 53) + 0); // 9007199254740992 console.log(Math.pow(2, 53) + 1); // 9007199254740992 誤差 console.log(Math.pow(2, 53) + 2); // 9007199254740994 console.log(Math.pow(2, 53) + 3); // 9007199254740996 誤差 console.log(Math.pow(2, 53) + 4); // 9007199254740996 console.log(
![JavaScriptの整数の精度が保たれるのは9007199254740991まで - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/3db75211b794246aa89b8caf5bcc3b6c595ca127/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-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9SmF2YVNjcmlwdCVFMyU4MSVBRSVFNiU5NSVCNCVFNiU5NSVCMCVFMyU4MSVBRSVFNyVCMiVCRSVFNSVCQSVBNiVFMyU4MSU4QyVFNCVCRiU5RCVFMyU4MSU5RiVFMyU4MiU4QyVFMyU4MiU4QiVFMyU4MSVBRSVFMyU4MSVBRjkwMDcxOTkyNTQ3NDA5OTElRTMlODElQkUlRTMlODElQTcmdHh0LWFsaWduPWxlZnQlMkN0b3AmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZzPTJlNjI3Y2E5M2JjNjFmNmI5NmUyNTMzYWZlNWVlM2U1%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBzdWluJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0wMmNiMDRkYmM5YTE5NjlkMWUyMzlhNTg4NGFiYzQ4ZA%26blend-x%3D142%26blend-y%3D436%26blend-mode%3Dnormal%26txt64%3DaW4gQ3JhZnRzbWFuIFNvZnR3YXJl%26txt-width%3D770%26txt-clip%3Dend%252Cellipsis%26txt-color%3D%2523212121%26txt-font%3DHiragino%2520Sans%2520W6%26txt-size%3D36%26txt-x%3D156%26txt-y%3D536%26s%3Db9a1b60e1adfff73bc0ac1d68ca23336)