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This article mainly shows you "how WeChat Mini Programs declares variables". The content is simple and clear. I hope it can help you solve your doubts. Next, let the editor lead you to study and learn the article "how WeChat Mini Programs declares variables".

Concept

Variables in WXS are references to values.

Variables that are not declared are directly assigned and are defined as global variables.

If only variables are declared and no values are assigned, the default value is undefined.

The performance of var is consistent with that of javascript, and there will be variable improvement.

Var foo = 1 bar = "hello world"; var I; / / I = undefined

The above code declares three variables foo, bar and I respectively. Then, foo assigns the numeric value 1, and bar assigns the string "hello wolrd".

Variable name

Variable naming must follow the following two rules:

The first character must be: letter (a-zA-Z), underscore (_)

The remaining characters can be: letters (a-zA-Z), underscores (_), numbers (0-9)

Reserved identifier

The following identifiers cannot be used as variable names:

Delete void typeofnull undefined NaN Infinity varif else true falserequirethis function argumentsreturnforwhiledobreakcontinueswitchcasedefault above is all the contents of the article "how WeChat Mini Programs declares variables". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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