{"id":1912,"date":"2021-05-24T17:36:54","date_gmt":"2021-05-24T17:36:54","guid":{"rendered":"https:\/\/lvboard.infostore.in.ua\/?p=1912"},"modified":"2021-05-24T17:36:54","modified_gmt":"2021-05-24T17:36:54","slug":"%e2%80%8b%e2%80%8b%d0%b8%d0%bd%d1%82%d0%b5%d1%80%d0%b5%d1%81%d0%bd%d1%8b%d0%b5-%d1%84%d0%b0%d0%ba%d1%82%d1%8b-%d0%bf%d1%80%d0%be-javascript","status":"publish","type":"post","link":"https:\/\/lvboard.infostore.in.ua\/?p=1912","title":{"rendered":"\u200b\u200b\u0418\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0435 \u0444\u0430\u043a\u0442\u044b \u043f\u0440\u043e JavaScript"},"content":{"rendered":"\n<p><strong># NaN \u044d\u0442\u043e \u0447\u0438\u0441\u043b\u043e<\/strong><br><strong>NaN (N<\/strong>ot <strong>A N<\/strong>umber<strong>) \u044d\u0442\u043e \u0447\u0438\u0441\u043b\u043e,<\/strong><br><strong>\u0430 \u0442\u0430\u043a\u0436\u0435 NaN \u043d\u0435 \u0440\u0430\u0432\u0435\u043d \u0441\u0430\u043c\u043e\u043c\u0443 \u0441\u0435\u0431\u0435.<\/strong><br>\u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0447\u0442\u043e \u0442\u043e \u043d\u0430 \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e \u0441 <strong>NaN<\/strong>, \u044d\u0442\u043e \u0444\u0443\u043d\u043a\u0446\u0438\u044f <strong>isNaN().<\/strong><br><code>NaN === NaN<\/code><br><code>\/\/ False<\/code><br><code>typeof NaN<\/code><br><code>\/\/ Number<\/code><\/p>\n\n\n\n<!--more-->\n\n\n\n<p><strong># Null \u044d\u0442\u043e \u043e\u0431\u044a\u0435\u043a\u0442<\/strong><br>\u0412\u0441\u0435 JavaScript-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0441\u0442\u044b \u0434\u0430\u0432\u043d\u043e \u043f\u0440\u0438\u0432\u044b\u043a\u043b\u0438 \u043a \u0442\u043e\u043c\u0443, \u0447\u0442\u043e<br><code>typeof null === 'object'; \/\/ true<\/code>,<br>\u0445\u043e\u0442\u044f \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 null \u2014 \u043f\u0440\u0438\u043c\u0438\u0442\u0438\u0432\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u041c\u043d\u043e\u0433\u0438\u0435 \u0437\u043d\u0430\u044e\u0442, \u0447\u0442\u043e \u044d\u0442\u043e \u0431\u0430\u0433, \u0438 \u043b\u0438\u0447\u043d\u043e \u0411\u0440\u044d\u043d\u0434\u0430\u043d \u0410\u0439\u043a \u044d\u0442\u043e <a href=\"\/\/unsafe_url?url=http%3A%2F%2Fwiki.ecmascript.org%2Fdoku.php%3Fid%3Dharmony%3Atypeof_null\" target=\"_blank\" rel=\"noreferrer noopener\">\u043f\u0440\u0438\u0437\u043d\u0430\u0435\u0442<\/a>. \u042d\u0442\u043e\u0442 \u0431\u0430\u0433, \u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e, \u043d\u0438\u043a\u043e\u0433\u0434\u0430 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d \u0438\u0437-\u0437\u0430 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u0439 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043d\u043e\u0432\u044b\u043c\u0438 \u0432\u0435\u0440\u0441\u0438\u044f\u043c\u0438 \u044f\u0437\u044b\u043a\u0430.<\/p>\n\n\n\n<p><strong># 0.1+0.2 === 0.3 \/\/ False<\/strong><br>\u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u044d\u0442\u043e \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e. \u041a\u043e\u0433\u0434\u0430 \u0443 \u0432\u0430\u0441 \u0435\u0441\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0441 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0435\u043c 10 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043d\u0430\u0448\u0430), \u043e\u043d\u0430 \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0440\u0430\u0436\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u0440\u043e\u0431\u0438, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u043c\u043d\u043e\u0436\u0438\u0442\u0435\u043b\u044c \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u044f. \u041f\u0440\u043e\u0441\u0442\u044b\u0435 \u043c\u043d\u043e\u0436\u0438\u0442\u0435\u043b\u0438 10 &#8211; \u044d\u0442\u043e 2 \u0438 5. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, 1\/2, 1\/4, 1\/5, 1\/8 \u0438 1\/10 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u044b \u0447\u0438\u0441\u0442\u043e, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0432\u0441\u0435 \u0437\u043d\u0430\u043c\u0435\u043d\u0430\u0442\u0435\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u043c\u043d\u043e\u0436\u0438\u0442\u0435\u043b\u0438 10. \u041d\u0430\u043f\u0440\u043e\u0442\u0438\u0432, 1 \/ 3, 1\/6, 1\/7 \u0438 1\/9 &#8211; \u0432\u0441\u0435 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u044e\u0449\u0438\u0435\u0441\u044f \u0434\u0435\u0441\u044f\u0442\u0438\u0447\u043d\u044b\u0435 \u0434\u0440\u043e\u0431\u0438, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0438\u0445 \u0437\u043d\u0430\u043c\u0435\u043d\u0430\u0442\u0435\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u043c\u043d\u043e\u0436\u0438\u0442\u0435\u043b\u044c 3 \u0438\u043b\u0438 7.<\/p>\n","protected":false},"excerpt":{"rendered":"<p># NaN \u044d\u0442\u043e \u0447\u0438\u0441\u043b\u043eNaN (Not A Number) \u044d\u0442\u043e \u0447\u0438\u0441\u043b\u043e,\u0430 \u0442\u0430\u043a\u0436\u0435 NaN \u043d\u0435 \u0440\u0430\u0432\u0435\u043d \u0441\u0430\u043c\u043e\u043c\u0443 \u0441\u0435\u0431\u0435.\u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0447\u0442\u043e \u0442\u043e \u043d\u0430 \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u043e \u0441 NaN, \u044d\u0442\u043e \u0444\u0443\u043d\u043a\u0446\u0438\u044f isNaN().NaN === NaN\/\/ Falsetypeof NaN\/\/ Number<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[95],"_links":{"self":[{"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/posts\/1912"}],"collection":[{"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1912"}],"version-history":[{"count":1,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/posts\/1912\/revisions"}],"predecessor-version":[{"id":1913,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=\/wp\/v2\/posts\/1912\/revisions\/1913"}],"wp:attachment":[{"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1912"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1912"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lvboard.infostore.in.ua\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1912"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}