What does the reserved word mean in javascript

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In javascript, reserved words are a set of names (or commands) that are prepared to be used within the JavaScript language specified by ECMA-262, and cannot be used as variables, function names, object names, and so on. The reserved word is reserved for the upgraded version of JavaScript and is not recommended for users.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Reserved word

Reserved words are a set of names (or commands) that are ready to be used within the JavaScript language specified by ECMA-262. These names currently have no specific use, are reserved for the upgrade version of JavaScript, and users are not advised to use them. The details are shown in the table.

ECMAScript reserved word abstractdoublegotonativestaticbooleanenumimplementspackagesuperbyteexportimportprivatesynchronizedcharextendsintprotectedthrowsclassfinalinterfacepublictransientconstfloatlongshortvolatile

ECMAScript 3 lists all Java keywords as reserved, while ECMAScript 5 is more flexible.

For example, in non-strict mode, only class, const, enums, export, extends, import, super are reserved words, while other ECMAScript 3 reserved words are free to use; in strict mode, ECMAScript 5 becomes more cautious, strictly restricting the use of implements, interface, let, package, private, protected, public, static, yield, eval (non-reserved words) and arguments (non-reserved words).

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