{"id":133250,"date":"2025-01-17T21:46:13","date_gmt":"2025-01-17T15:46:13","guid":{"rendered":"http:\/\/rcl-radio.ru\/?p=133250"},"modified":"2025-01-17T21:46:13","modified_gmt":"2025-01-17T15:46:13","slug":"%d0%bf%d1%80%d0%b5%d0%be%d0%b1%d1%80%d0%b0%d0%b7%d0%be%d0%b2%d0%b0%d0%bd%d0%b8%d0%b5-%d1%82%d0%b8%d0%bf%d0%be%d0%b2-javascript","status":"publish","type":"post","link":"http:\/\/rcl-radio.ru\/?p=133250","title":{"rendered":"\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432 JavaScript"},"content":{"rendered":"

\u0412 JavaScript \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442\u044c \u044f\u0432\u043d\u043e (<\/span>\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0441\u0442\u043e\u043c)<\/span> \u0438\u043b\u0438 \u043d\u0435\u044f\u0432\u043d\u043e (<\/span>\u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u043e\u043c)<\/span>. \u0412\u043e\u0442 \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0441\u043f\u043e\u0441\u043e\u0431\u044b \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432:<\/p>\n

\u042f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432<\/strong>
\n\u042f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0441\u0442 \u044f\u0432\u043d\u043e \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442, \u043a\u0430\u043a\u043e\u0439 \u0442\u0438\u043f \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043e\u043b\u0436\u0435\u043d \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442.<\/p>\n

\u0427\u0438\u0441\u043b\u043e\u0432\u043e\u0439 \u0442\u0438\u043f (<\/span>Number<\/span>)<\/span><\/strong><\/p>\n

let str = «123»<\/span>;
\nlet num = Number<\/span>(<\/span>str)<\/span>;
\nconsole.log<\/span>(<\/span>typeof<\/span> num)<\/span>; \/\/ number<\/span>
\nconsole.log<\/span>(<\/span>num + 1<\/span>)<\/span>; \/\/ 124<\/span><\/p><\/blockquote>\n

\u0421\u0442\u0440\u043e\u043a\u043e\u0432\u044b\u0439 \u0442\u0438\u043f (<\/span>String<\/span>)<\/span><\/strong><\/p>\n

let num = 123<\/span>;
\nlet str = String<\/span>(<\/span>num)<\/span>;
\nconsole.log<\/span>(<\/span>typeof<\/span> str)<\/span>; \/\/ string<\/span>
\nconsole.log<\/span>(<\/span>str + » is a number»<\/span>)<\/span>; \/\/ «123 is a number»<\/span><\/p><\/blockquote>\n

\u0411\u0443\u043b\u0435\u0432\u044b\u0439 \u0442\u0438\u043f (<\/span>Boolean<\/span>)<\/span><\/strong><\/p>\n

let num = 0<\/span>;
\nlet bool = Boolean<\/span>(<\/span>num)<\/span>;
\nconsole.log<\/span>(<\/span>typeof<\/span> bool)<\/span>; \/\/ boolean<\/span>
\nconsole.log<\/span>(<\/span>bool)<\/span>; \/\/ false<\/span><\/p>\n

num = 1<\/span>;
\nbool = Boolean<\/span>(<\/span>num)<\/span>;
\nconsole.log<\/span>(<\/span>bool)<\/span>; \/\/ true<\/span><\/p><\/blockquote>\n

\u041c\u0430\u0441\u0441\u0438\u0432 (<\/span>Array<\/span>)<\/span><\/strong><\/p>\n

let str = «hello»<\/span>;
\nlet arr = Array<\/span>.from<\/span>(<\/span>str)<\/span>;
\nconsole.log<\/span>(<\/span>arr)<\/span>; \/\/ [ ‘h’, ‘e’, ‘l’, ‘l’, ‘o’ ]<\/span><\/p><\/blockquote>\n

\u041d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0435 \u0441\u043b\u0443\u0447\u0430\u0438 \u044f\u0432\u043d\u043e\u0433\u043e \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f<\/strong>
\n\u041d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0440\u0430\u0437\u043d\u044b\u0435 \u0442\u0438\u043f\u044b \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0438 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0442\u044c \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b:<\/p>\n

\u0424\u0443\u043d\u043a\u0446\u0438\u044f parseInt<\/span>(<\/span>)<\/span><\/strong>
\n\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u0443\u0435\u0442 \u0441\u0442\u0440\u043e\u043a\u0443 \u0432 \u0446\u0435\u043b\u043e\u0435 \u0447\u0438\u0441\u043b\u043e. \u0415\u0441\u043b\u0438 \u0441\u0442\u0440\u043e\u043a\u0430 \u043d\u0430\u0447\u0438\u043d\u0430\u0435\u0442\u0441\u044f \u0441 \u0447\u0438\u0441\u0435\u043b, \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0432\u0435\u0440\u043d\u0451\u0442 \u0438\u0445, \u0438\u043d\u0430\u0447\u0435 \u2014 NaN<\/span>.<\/p>\n

let<\/span> str = «123abc»<\/span>;
\nlet num = parseInt<\/span>(<\/span>str)<\/span>;
\nconsole.log<\/span>(<\/span>num)<\/span>; \/\/ 123<\/span><\/p><\/blockquote>\n

\u0424\u0443\u043d\u043a\u0446\u0438\u044f parseFloat<\/span>(<\/span>)<\/span><\/strong>
\n\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u0443\u0435\u0442 \u0441\u0442\u0440\u043e\u043a\u0443 \u0432 \u0447\u0438\u0441\u043b\u043e \u0441 \u043f\u043b\u0430\u0432\u0430\u044e\u0449\u0435\u0439 \u0442\u043e\u0447\u043a\u043e\u0439.<\/p>\n

let<\/span> str = «123.45abc»<\/span>;
\nlet num = parseFloat<\/span>(<\/span>str)<\/span>;
\nconsole.log<\/span>(<\/span>num)<\/span>; \/\/ 123.45<\/span><\/p><\/blockquote>\n

\u041d\u0435\u044f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432<\/strong>
\n\u041d\u0435\u044f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b, \u043a\u043e\u0433\u0434\u0430 JavaScript \u043f\u044b\u0442\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 \u043a \u043d\u0443\u0436\u043d\u043e\u043c\u0443 \u0442\u0438\u043f\u0443.<\/p>\n

\u0421\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u0441 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u043e\u043c ==<\/strong>
\n\u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u043d\u0435\u0441\u0442\u0440\u043e\u0433\u043e\u0433\u043e \u0440\u0430\u0432\u0435\u043d\u0441\u0442\u0432\u0430 (<\/span>==)<\/span> \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432.<\/p>\n

let<\/span> num = 123<\/span>;
\nlet str = «123»<\/span>;<\/p>\n

console.log<\/span>(<\/span>num == str)<\/span>; \/\/ true<\/span><\/p><\/blockquote>\n

\u041a\u043e\u043d\u043a\u0430\u0442\u0435\u043d\u0430\u0446\u0438\u044f \u0441\u0442\u0440\u043e\u043a<\/strong>
\n\u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 + \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043a\u043e\u043d\u043a\u0430\u0442\u0435\u043d\u0430\u0446\u0438\u0438 \u0441\u0442\u0440\u043e\u043a. \u0415\u0441\u043b\u0438 \u043e\u0434\u0438\u043d \u0438\u0437 \u043e\u043f\u0435\u0440\u0430\u043d\u0434\u043e\u0432 \u2014 \u0441\u0442\u0440\u043e\u043a\u0430, \u0434\u0440\u0443\u0433\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u043d\u0434 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d \u0432 \u0441\u0442\u0440\u043e\u043a\u0443.<\/p>\n

let<\/span> num = 123<\/span>;
\nlet str = «The number is: «<\/span> + num;
\nconsole.log<\/span>(<\/span>str)<\/span>; \/\/ The number is: 123<\/span><\/p><\/blockquote>\n

\u041b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b<\/strong>
\n\u041b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b (<\/span>&&<\/span>, ||<\/span>, !<\/span>)<\/span> \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043a \u0431\u0443\u043b\u0435\u0432\u043e\u043c\u0443 \u0442\u0438\u043f\u0443.<\/p>\n

let<\/span> num = 0<\/span>;
\nlet result = !!<\/span>num;
\nconsole.log<\/span>(<\/span>result)<\/span>; \/\/ false<\/span><\/p>\n

num = 1<\/span>;
\nresult = !!<\/span>num;
\nconsole.log<\/span>(<\/span>result)<\/span>; \/\/ true<\/span><\/p><\/blockquote>\n

\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u0440\u0438 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0442\u0438\u043f\u043e\u0432<\/strong>
\n\u0418\u043d\u043e\u0433\u0434\u0430 \u043d\u0435\u044f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0438\u043f\u043e\u0432 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u044c \u043a \u043d\u0435\u043e\u0436\u0438\u0434\u0430\u043d\u043d\u044b\u043c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430\u043c:<\/p>\n

let num = «1»<\/span>;
\nlet result = num + 2<\/span>; \/\/ «12» (\u043a\u043e\u043d\u043a\u0430\u0442\u0435\u043d\u0430\u0446\u0438\u044f)<\/span><\/p>\n

num = Number<\/span>(<\/span>num)<\/span>;
\nresult = num + 2<\/span>; \/\/ 3 (\u0430\u0440\u0438\u0444\u043c\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f)<\/span><\/p><\/blockquote>\n

\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/strong>
\n\u041f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u043e\u0432 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0442\u0438\u043f\u043e\u0432 \u0432 JavaScript \u0432\u0430\u0436\u043d\u043e \u0434\u043b\u044f \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u0438\u044f \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0438 \u043f\u0440\u0435\u0434\u0441\u043a\u0430\u0437\u0443\u0435\u043c\u043e\u0433\u043e \u043a\u043e\u0434\u0430. \u042f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u0430\u0451\u0442 \u0431\u043e\u043b\u044c\u0448\u0438\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u043d\u0430\u0434 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c, \u0442\u043e\u0433\u0434\u0430 \u043a\u0430\u043a \u043d\u0435\u044f\u0432\u043d\u043e\u0435 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0437\u044b\u0432\u0430\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u0438, \u0435\u0441\u043b\u0438 \u043d\u0435 \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u0442\u044c \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0431\u043e\u0442\u044b JavaScript.<\/p>\n","protected":false},"excerpt":{"rendered":"

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