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This article introduces the knowledge of "how to repeatedly declare JavaScript variables". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Repeatedly declare JavaScript variables

If you declare a JavaScript variable again, its value will not be lost.

After these two statements are executed, the value of the variable carName is still "porsche":

Example

Var carName = "porsche"

Var carName

JavaScript arithmetic

Similar to algebra, you can do arithmetic through the JavaScript variable, using operators such as = and +:

Example

Var x = 3 + 5 + 8

Strings can also use a plus sign, but strings will be concatenated:

Example

Var x = "Bill" + "" + "Gates"

You can also try this:

Example

Var x = "8" + 3 + 5

Tip: if you put the values to be given in quotation marks, the rest of the values will be treated as strings and concatenated.

Now try this:

Example

Var x = 3 + 5 + "8"

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