Data type conversions

Display Type conversions:

Number (): A numeric array that can recognize purely numeric strings (which can be with the-+ symbol). If the array is empty, 0,false is 0,true to 1, and if the string has other alphabetic symbols, it returns Nan, and if the function or object returns Nan

parseint (): A string that can be identified with a letter, but must start with a number and recognize only the first digit of the string.

Parsefloat (): Ibid.

Implicitly-Typed conversions:

-*/% + +--can convert a string to a number

< > If a number is compared to a string type, it will be converted to a number, and if the string is compared to a string, it will be encoded by encoding and will not be converted to a number

+ can convert a number to a string

！ Convert the data type on the right to a Boolean value

NAN (not a number): for numeric types

Once the Write program appears nan must have been illegally manipulated

Nan is False

Nan===nan to False

IsNAN (): You can tell if certain values are numbers. is not a number true and the number is false. (When executed, the content is converted by number () and judged by the converted result)

Note: Everything you get in HTML is a string

Data type conversions