What is the method of converting javaScript ​ numeric type to string type?

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Suppose the int/float/double variable is: num and the converted string is: str

There are three ways to convert it to a string, which are as follows:

(1) str =

String.valueOf (num)

(2) str

= Integer.toString (num)

(3) str = num+ ""

2. The transformation from string type to numerical type (this is int as an example, double,float is similar)

There are two ways of transformation.

They are as follows:

(1) num=Integer.parseInt (str)

(2)

Num=Integer.valueOf (str). IntValue (); parseInt () parseFloat ()

(3) num=parseInt (str)

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