Is javascript case sensitive?

JavaScript is a case-sensitive language, which means that when entering language keywords, variables, function names, and all identifiers, you must use consistent character case.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript is a literal scripting language. It is a dynamically typed, weakly typed, prototype-based language with built-in support for types. Its interpreter is called the JavaScript engine, which is part of the browser and is widely used in client-side scripting languages. It was first used on HTML (an application under Standard Universal Markup Language) web pages to add dynamic functions to HTML web pages. .

JavaScript is a case-sensitive language, which means that when entering language keywords, variables, function names, and all identifiers, you must adopt consistent character case.

For example, the keyword "while" must be entered as "while" and cannot be entered as "While" or "WHILE". Similarly, "online", "Online", "OnLine" and "ONLINE" " are four different variable names.

But be aware that HTML is not case-sensitive, which can be easily confused since it is closely related to client-side JavaScript. Many JavaScript objects and properties have the same names as the HTML tags and properties they represent.

In HTML these tags and property names can be entered in any case, but in JavaScript they are usually lowercase. For example, in HTML, the event handler property onclick is usually declared as onClick, but in JavaScript code only onclick can be used.

[Recommended learning: javascript advanced tutorial]

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