{"id":8320,"date":"2015-04-01T19:30:21","date_gmt":"2015-04-01T23:30:21","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=8320"},"modified":"2015-11-11T06:29:45","modified_gmt":"2015-11-11T11:29:45","slug":"%e0%a6%9c%e0%a6%be%e0%a6%ad%e0%a6%be%e0%a6%b8%e0%a7%8d%e0%a6%95%e0%a7%8d%e0%a6%b0%e0%a6%bf%e0%a6%aa%e0%a7%8d%e0%a6%9f-%e0%a6%b8%e0%a7%8d%e0%a6%9f%e0%a7%8d%e0%a6%b0%e0%a6%bf%e0%a6%95%e0%a7%8d%e0%a6%9f","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=8320","title":{"rendered":"\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f (JavaScript Use Strict)"},"content":{"rendered":"<h2>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f (JavaScript Use Strict)<\/h2>\n<p>\u09ae\u09cb\u09b9\u09be\u09ae\u09cd\u09ae\u09be\u09a6 \u0986\u09ae\u09bf\u09b0\u09c1\u09b2 \u0987\u09b8\u09b2\u09be\u09ae (\u0986\u09b0\u09bf\u09ab)<\/p>\n<p>\u0993\u09df\u09c7\u09ac \u09a1\u09bf\u099c\u09be\u0987\u09a8\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u09a1\u09c7\u09ad\u09c7\u09b2\u09aa\u09be\u09b0<\/p>\n<p>&nbsp;<\/p>\n<h2>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f (JavaScript Use Strict)<strong><br \/>\n<\/strong><\/h2>\n<p><strong>Use Strict<\/strong> &#8220;\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f&#8221; \u09b9\u09b2 \u098f\u09ae\u09a8 \u098f\u0995\u099f\u09bf \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u0995\u09cb\u09a1 \u09af\u09be Strict mode &#8220;\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7&#8221; \u099a\u09be\u09b2\u09c1 \u09b9\u09df\u0964<\/p>\n<p>&nbsp;<\/p>\n<h2>\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be (The &#8220;use strict&#8221; Directive)<\/h2>\n<p>\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be (The &#8220;use strict&#8221; Directive) \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f 1.8.5 (ECMAScript version 5) \u098f \u09a8\u09a4\u09c1\u09a8 \u0964<\/p>\n<p>\u098f\u099f\u09be \u0995\u09cb\u09a8 \u09b8\u09cd\u099f\u09c7\u099f\u09ae\u09c7\u09a8\u09cd\u099f \u09a8\u09df \u0995\u09bf\u09a8\u09cd\u09a4\u09c1 \u098f\u099f\u09bf \u098f\u0995\u099f\u09bf \u0986\u0995\u09cd\u09b7\u09b0\u09bf\u0995 \u0985\u09ad\u09bf\u09ac\u09cd\u09af\u0995\u09cd\u09a4\u09bf\u0964 \u098f\u099f\u09bf \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f\u099f\u09c7\u09b0 \u09a8\u09a4\u09c1\u09a8 \u09ad\u09be\u09b0\u09cd\u09b8\u09a8 \u0964 \u09aa\u09c1\u09b0\u09be\u09a4\u09a8 \u09ad\u09be\u09b0\u09cd\u09b8\u09a8 \u098f \u098f\u099f\u09bf \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u09af\u09be\u09df \u09a8\u09be\u0964<\/p>\n<p>Use Strict (\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f) \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be\u09b0 \u0989\u09a6\u09cd\u09a6\u09c7\u09b6\u09cd\u09af \u098f\u0995\u099f\u09bf \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0995\u09cb\u09a1 \u09af\u09be Strict mode (\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1) \u098f \u099a\u09be\u09b2\u09c1 \u09b9\u09ac\u09c7 \u0964<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Strict mode &#8220;<\/strong><strong>\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7&#8221; \u09b8\u09be\u09aa\u09cb\u09b0\u09cd\u099f \u0995\u09b0\u09c7 \u09ac\u09cd\u09b0\u09be\u0989\u099c\u09be\u09b0\u09c7\u09b0\u09c7 \u098f\u0987 \u09ad\u09be\u09b0\u09cd\u09b8\u09a8 \u0997\u09c1\u09b2\u09cb\u09a4\u09c7<\/strong><\/p>\n<ul>\n<li>Internet Explorer from version 10<\/li>\n<li>Firefox from version 4<\/li>\n<li>Chrome from version 13<\/li>\n<li>Safari from version 5.1<\/li>\n<li>Opera from version 12<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7 <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u0998\u09cb\u09b7\u09a3\u09be<\/span><\/span> (Declaring Strict Mode):<\/h2>\n<p>Strict mode &#8220;\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7&#8221; <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u0998\u09cb\u09b7\u09a3\u09be<\/span><\/span> \u0995\u09b0\u09be \u09b9\u09df <strong>Use Strict<\/strong> (\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f) \u098f\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u0964 \u098f\u099f\u09bf \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09ab\u09be\u0987\u09b2\u09c7\u09b0 \u09b6\u09c1\u09b0\u09c1\u09a4\u09c7 \u0985\u09a5\u09ac\u09be \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09ab\u09be\u0982\u09b6\u09a8 \u098f\u09b0 \u09ad\u09bf\u09a4\u09b0 \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u09b9\u09df\u09c7 \u09a5\u09be\u0995\u09c7\u0964<\/p>\n<p>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f\u09c7\u09b0 \u09b6\u09c1\u09b0\u09c1\u09a4\u09c7 \u0998\u09cb\u09b7\u09a3\u09be \u0995\u09b0\u09be \u09b9\u09b2\u09cb \u098f\u09b0 \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u09ac\u09cd\u09af\u09aa\u09cd\u09a4\u09bf \u09a5\u09be\u0995\u09ac\u09c7\u0964 (\u09b8\u0995\u09b2 \u0995\u09cb\u09a1 \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1 \u098f \u0995\u09be\u09b0\u09cd\u09af\u0995\u09b0 \u09b9\u09ac\u09c7)<\/p>\n<p>\u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u09ad\u09bf\u09a4\u09b0\u09c7 \u0998\u09cb\u09b7\u09a3\u09be \u0995\u09b0\u09be \u09b9\u09b2\u09cb \u098f\u09b0 \u09b2\u09cb\u0995\u09be\u09b2 \u09ac\u09cd\u09af\u09aa\u09cd\u09a4\u09bf \u09a5\u09be\u0995\u09ac\u09c7\u0964 (\u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u09ad\u09bf\u09a4\u09b0\u09c7\u09b0 \u0995\u09cb\u09a1\u0997\u09c1\u09b2\u09cb \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1 \u098f \u0995\u09be\u09b0\u09cd\u09af\u0995\u09b0 \u09b9\u09ac\u09c7)<\/p>\n<p>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09ab\u09be\u0987\u09b2\u09c7\u09b0 \u09b6\u09c1\u09b0\u09c1\u09a4\u09c7\u0983<\/p>\n<hr \/>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;<\/pre>\n<pre>&lt;p&gt;Global \"use strict\" declaration.&lt;\/p&gt;<\/pre>\n<pre>&lt;p&gt;Activate debugging in your browser to see the error report.&lt;\/p&gt;<\/pre>\n<pre>&lt;script&gt;\r\n\"use strict\";\r\ny= 3.14;       \/\/ This will cause an error.\r\nmyFunction();  \/\/ This will also cause an error.<\/pre>\n<pre>function myFunction() {\r\n      x = 3.14;\r\n}\r\n&lt;\/script&gt;<\/pre>\n<pre>&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><!--<span class=\"hiddenSpellError\" pre=\"\" data-mce-bogus=\"1\"--><\/p>\n<p>&nbsp;<\/p>\n<p>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09ab\u09be\u0982\u09b6\u09a8 \u098f\u09b0 \u09ad\u09bf\u09a4\u09b0\u0983<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<pre>&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;body&gt;<\/pre>\n<pre>&lt;p&gt;Local \"use strict\" declaration.&lt;\/p&gt;<\/pre>\n<pre>&lt;p&gt;Activate debugging in your browser to see the error report.&lt;\/p&gt;<\/pre>\n<pre>&lt;script&gt;\r\ny= 3.14;        \/\/ This will not cause an error.\r\nmyFunction();   \/\/ This will cause an error.<\/pre>\n<pre>function myFunction() {\r\n     \"use strict\";\r\n     x = 3.14;\r\n}\r\n&lt;\/script&gt;<\/pre>\n<pre>&lt;\/body&gt;\r\n&lt;\/html&gt;<\/pre>\n<hr \/>\n<pre><\/pre>\n<h2>&#8220;\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f&#8221; \u09b8\u09bf\u09a8\u099f\u09cd\u09af\u09be\u0995\u09cd\u09b8 (The &#8220;use strict&#8221;; Syntax)<\/h2>\n<p>\u09b8\u09bf\u09a8\u099f\u09cd\u09af\u09be\u0995\u09cd\u09b8 \u09af\u09c7\u09a8 \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f\u099f\u09c7\u09b0 \u09aa\u09c1\u09b0\u09cb\u09a8\u09cb \u09b8\u0982\u09b8\u09cd\u0995\u09b0\u09a3\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u09be\u09ae\u099e\u09cd\u099c\u09b8\u09cd\u09af\u09aa\u09c2\u09b0\u09cd\u09a3 \u09b9\u09df \u09b8\u09c7\u09ad\u09be\u09ac\u09c7 \u09b8\u09be\u099c\u09be\u09a8 \u09b9\u09df\u09c7\u099b\u09c7\u0964<\/p>\n<p>\u0995\u09ae\u09cd\u09aa\u09be\u0987\u09b2 \u0995\u09b0\u09be\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 \u098f\u0995\u099f\u09bf \u09b8\u09be\u0982\u0996\u09cd\u09af\u09bf\u0995 \u0986\u0995\u09cd\u09b7\u09b0\u09bf\u0995 (4 + + 5) \u0985\u09a5\u09ac\u09be \u098f\u0995\u099f\u09bf \u0986\u0995\u09cd\u09b7\u09b0\u09bf\u0995 \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0982 (&#8220;jamal kamal&#8221;;) \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09c7 \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae\u09c7 \u0995\u09cb\u09a8 \u09aa\u09be\u09b0\u09cd\u09b6\u09cd\u09ac \u09aa\u09cd\u09b0\u09a4\u09bf\u0995\u09cd\u09b0\u09bf\u09af\u09bc\u09be \u09a8\u09c7\u0987\u0964\u098f\u099f\u09bf \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u0995\u09ae\u09cd\u09aa\u09be\u0987\u09b2 \u09b9\u09df \u0985\u09ac\u09bf\u09a6\u09cd\u09af\u09ae\u09be\u09a8 \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u098f\u09ac\u0982 \u09a1\u09be\u09df\u09c7\u09b8 \u098f\u09b0 \u09b8\u09be\u09a5\u09c7\u0964<\/p>\n<p>\u09b8\u09c1\u09a4\u09b0\u09be\u0982, &#8220;\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f&#8221; \u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u09a8\u09a4\u09c1\u09a8 \u0995\u09ae\u09cd\u09aa\u09be\u0987\u09b2\u09be\u09b0 (\u09b8\u0982\u0997\u09cd\u09b0\u09b9\u0995) \u098f \u0995\u09be\u099c \u0995\u09b0\u09c7, \u09af\u09c7 \u0995\u09ae\u09cd\u09aa\u0987\u09b2\u09be\u09ae \u098f\u09b0 \u09ae\u09be\u09a8\u09c7 \u09ac\u09c1\u099d\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u0964<\/p>\n<p>&nbsp;<\/p>\n<h2>\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1 (Strict mode) \u0995\u09c7\u09a8?<\/h2>\n<p>Strict mode \u201c\u09a8\u09bf\u09b0\u09be\u09aa\u09a6\u201d \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b2\u09bf\u0996\u09a4\u09c7 \u09b8\u09be\u09b9\u09be\u09af\u09cd\u09af \u0995\u09b0\u09c7 \u0964<\/p>\n<p>Strict mode \u09aa\u09c2\u09b0\u09cd\u09ac\u09ac\u09b0\u09cd\u09a4\u09c0\u00a0 &#8220;bad syntax&#8221; \u09aa\u09b0\u09bf\u09ac\u09b0\u09cd\u09a4\u09a8 \u0995\u09b0\u09c7\u00a0 &#8220;real errors&#8221; \u0997\u09cd\u09b0\u09b9\u09a3 \u0995\u09b0\u09c7\u0964<\/p>\n<p>\u0989\u09a6\u09be\u09b9\u09b0\u09a3 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7, \u09b8\u09cd\u09ac\u09be\u09ad\u09be\u09ac\u09bf\u0995 \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f, \u098f\u0995\u099f\u09bf \u09ae\u09bf\u09b8\u099f\u09be\u0987\u09aa\u09bf\u0982 \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u098f\u0995\u099f\u09bf \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u09b8\u09c3\u09b7\u09cd\u099f\u09bf \u0995\u09b0\u09c7\u0964<\/p>\n<p>Strict mode \u098f\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 \u098f\u0997\u09c1\u09b2\u09cb\u0995\u09c7 &#8220;erorr&#8221; \u09a6\u09c7\u0996\u09be\u09ac\u09c7, \u098f\u09ac\u0982 \u098f\u0996\u09be\u09a8\u09c7 \u0985\u09b8\u09be\u09ac\u09a7\u09be\u09a8\u09a4\u09be\u09ac\u09b6\u09a4\u0983 \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u09a4\u09c8\u09b0\u09bf \u09b9\u0993\u09df\u09be \u0985\u09b8\u09ae\u09cd\u09ad\u09ac\u0964<\/p>\n<p>\u09b8\u09be\u09a7\u09be\u09b0\u09a8 \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f\u099f\u09c7 \u098f\u0995\u099c\u09a8 \u09a1\u09c7\u09ad\u09c7\u09b2\u09aa\u09be\u09b0 \u0985 \u09b2\u09bf\u0996\u09a8\u09af\u09cb\u0997\u09cd\u09af \u09ac\u09c8\u09b6\u09bf\u09b7\u09cd\u099f\u09cd\u09af \u09ae\u09be\u09a8 \u09a8\u09bf\u09b0\u09cd\u09a7\u09be\u09b0\u09a3\u09c7\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 \u0995\u09cb\u09a8 \u09a4\u09cd\u09b0\u09c1\u099f\u09bf \u09aa\u09be\u09ac\u09c7\u09a8 \u09a8\u09be\u0964<\/p>\n<p>Strict mode \u09af\u09c7\u0995\u09cb\u09a8 assignment to a non-writable property, a getter-only property, a non-existing property, a non-existing variable, or a non-existing object \u0997\u09c1\u09b2\u09cb\u0995\u09c7 \u098f\u09b0\u09b0 &#8220;erorr&#8221; \u09a6\u09c7\u0996\u09be\u09ac\u09c7\u0964<\/p>\n<p>&nbsp;<\/p>\n<h2>(Strict mode) \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7 \u09af\u09be \u09af\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc<\/h2>\n<p>\u0998\u09cb\u09b7\u09a3\u09be \u09a8\u09be \u0995\u09b0\u09c7 \u09ad\u09c7\u09b0\u09bf\u09df\u09c7\u09ac\u09b2 (\u09aa\u09cd\u09b0\u09cb\u09aa\u09be\u09b0\u09cd\u099f\u09bf \u09ac\u09be \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f) \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09df\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nx = 3.14;            \/\/ This will cause an error (if x has not been declared)<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2, \u09ab\u09be\u0982\u09b6\u09a8 \u0985\u09a5\u09ac\u09be \u098f\u0997\u09cd\u09b0\u09bf\u09ae\u09c7\u09a8\u09cd\u099f \u09ae\u09c1\u099b\u09c7 \u09ab\u09c7\u09b2\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nx = 3.14;\r\ndelete x;                \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u098f\u0995\u09be\u09a7\u09bf\u0995 \u09ac\u09be\u09b0 \u09aa\u09cd\u09b0\u09cb\u09aa\u09be\u09b0\u09cd\u099f\u09bf \u09a8\u09bf\u09b0\u09cd\u09a7\u09be\u09b0\u09a3 \u0995\u09b0\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar x = {p1:10, p1:20}; \/\/ This will cause an error<\/pre>\n<hr \/>\n<pre><\/pre>\n<p>\u09aa\u09cd\u09af\u09be\u09b0\u09be\u09ae\u09bf\u099f\u09be\u09b0 \u098f\u09b0 \u09a8\u09be\u09ae \u09a8\u0995\u09b2 \u0995\u09b0\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nfunction x(p1, p1) {};           \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u0985\u09b7\u09cd\u099f\u0995 \u0997\u09a3\u09a8\u09be\u09aa\u09a6\u09cd\u09a7\u09a4\u09bf \u098f\u09ac\u0982 \u0985\u09ac\u09cd\u09af\u09be\u09b9\u09a4\u09bf \u0985\u0995\u09cd\u09b7\u09b0 \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar x = 010;           \/\/ This will cause an error\r\nvar y = \\010;          \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u09b0\u09c0\u09a1 \u0985\u09a8\u09b2\u09bf \u09aa\u09cd\u09b0\u09aa\u09be\u09b0\u09cd\u099f\u09bf &#8220;read-only property&#8221; \u09b2\u09c7\u0996\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar obj = {};\r\nobj.defineProperty(obj, \"x\", {value:0, writable:false});<\/pre>\n<pre>obj.x = 3.14;               \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u0997\u09c7\u099f \u0985\u09a8\u09b2\u09bf \u09aa\u09cd\u09b0\u09aa\u09be\u09b0\u09cd\u099f\u09bf &#8220;get-only property&#8221; \u09b2\u09c7\u0996\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar obj = {get x() {return 0} };<\/pre>\n<pre>obj.x = 3.14;           \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u0986\u09a8 \u09a1\u09bf\u09b2\u09bf\u099f\u098f\u09ac\u09b2 \u09aa\u09cd\u09b0\u09aa\u09be\u09b0\u09cd\u099f\u09bf \u09a1\u09bf\u09b2\u09bf\u099f \u0995\u09b0\u09be \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\ndelete Object.prototype;      \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0982 &#8220;eval&#8221; \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u09af\u09be\u09ac\u09c7 \u09a8\u09be\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar eval = 3.14;             \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0982 &#8220;arguments&#8221; \u09ad\u09c7\u09b0\u09bf\u09df\u09be\u09ac\u09b2 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09cd\u09af\u09be\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u09af\u09be\u09ac\u09c7 \u09a8\u09be\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nvar arguments = 3.14;       \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&#8220;with statement&#8221; \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964<\/p>\n<hr \/>\n<pre>\"use strict\";\r\nwith (Math){x = cos(2)};        \/\/ This will cause an error<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>\u09ad\u09ac\u09bf\u09b7\u09cd\u09af\u09a4\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09b8\u0982\u09b0\u0995\u09cd\u09b7\u09bf\u09a4 \u0995\u09c0\u0993\u09df\u09be\u09b0\u09cd\u09a1 \u201ckeywords&#8221; \u0997\u09c1\u09b2\u09cb\u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09bf\u09a4 \u09a8\u09af\u09bc\u0964\u00a0 \u09b8\u09c7\u0997\u09c1\u09b2\u09cb \u09b9\u09b2 :<\/p>\n<ul>\n<li>implements<\/li>\n<li>interface<\/li>\n<li>package<\/li>\n<li>private<\/li>\n<li>protected<\/li>\n<li>public<\/li>\n<li>static<\/li>\n<li>yield<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f (JavaScript Use Strict) \u09ae\u09cb\u09b9\u09be\u09ae\u09cd\u09ae\u09be\u09a6 \u0986\u09ae\u09bf\u09b0\u09c1\u09b2 \u0987\u09b8\u09b2\u09be\u09ae (\u0986\u09b0\u09bf\u09ab) \u0993\u09df\u09c7\u09ac \u09a1\u09bf\u099c\u09be\u0987\u09a8\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u09a1\u09c7\u09ad\u09c7\u09b2\u09aa\u09be\u09b0 &nbsp; \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f (JavaScript Use Strict) Use Strict &#8220;\u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f&#8221; \u09b9\u09b2 \u098f\u09ae\u09a8 \u098f\u0995\u099f\u09bf \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u0995\u09cb\u09a1 \u09af\u09be Strict mode &#8220;\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09ae\u09cb\u09a1\u09c7&#8221; \u099a\u09be\u09b2\u09c1 \u09b9\u09df\u0964 &nbsp; \u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be (The &#8220;use strict&#8221; Directive) \u0987\u0989\u099c \u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u099f \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be (The &#8220;use strict&#8221; Directive) \u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f 1.8.5 (ECMAScript version 5) &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=8320\">Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[65,136],"tags":[],"class_list":["post-8320","post","type-post","status-publish","format-standard","hentry","category-javascript-complete-courses","category-javascript-frameworks","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":11328,"url":"http:\/\/bangla.sitestree.com\/?p=11328","url_meta":{"origin":8320,"position":0},"title":"jQuery \u09b6\u09c1\u09b0\u09c1 \u0995\u09b0\u09be","author":"Rafiqul Islam","date":"November 12, 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\u09a6\u09c1\u099f\u09bf \u09ad\u09be\u09b0\u09cd\u09b8\u09a8 \u09b0\u09df\u09c7\u099b\u09c7: \u0989\u09ce\u09aa\u09be\u09a6\u09a8 \u09b8\u0982\u09b8\u09cd\u0995\u09b0\u09a3 - \u098f\u099f\u09bf \u0986\u09aa\u09a8\u09be\u09b0\u2026","rel":"","context":"In &quot;jQuery-001 \u0964 \u099c\u09c7 \u0995\u09c1\u09df\u09c7\u09b0\u09bf - \u09e6\u09e6\u09e7&quot;","block_context":{"text":"jQuery-001 \u0964 \u099c\u09c7 \u0995\u09c1\u09df\u09c7\u09b0\u09bf - \u09e6\u09e6\u09e7","link":"http:\/\/bangla.sitestree.com\/?cat=152"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":7097,"url":"http:\/\/bangla.sitestree.com\/?p=7097","url_meta":{"origin":8320,"position":1},"title":"\u099c\u09be\u09ad\u09be\u09b8\u09cd\u0995\u09cd\u09b0\u09bf\u09aa\u09cd\u099f \u0987\u09ad\u09c7\u09a8\u09cd\u099f (JavaScript Events)","author":"Author-Check- Article-or-Video","date":"April 1, 2015","format":false,"excerpt":"\u09b6\u09b0\u09bf\u09ab\u09c1\u09b2 \u0987\u09b8\u09b2\u09be\u09ae Job 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