javascript identifier
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In js, everything that can be named by ourselves can be called an identifier.
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For example: variable names, function names, and attribute names are all identifiers
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Rules to follow when naming an identifier:
1. The identifier can contain letters, numbers, _underscore, $
2. The identifier cannot start with a number
3. Identifiers cannot be keywords or reserved words in ES
4. Identifiers generally adopt camel case naming: the first letter is lowercase, the beginning of each word is uppercase, and the remaining letters are lowercase. For example: helloWord
lower case. For example: helloWord
- The Unicode encoding is actually used when storing identifiers at the bottom of JS, so in theory, all the content contained in utf-8 can be used as identifiers, and Chinese can also be used as identifiers, but it is not recommended.