Implementation principle and code of floating point numbers with two decimal places after positive and negative points_jquery

Background: The project needs to process positive and negative floating point numbers with two decimal points.

Requirements: Non-digit or . characters are automatically cleared, and the . 12 Automatic patching. The first 0

Principle: Add two events to the input box, keyup and blur. Keyup handles non-required characters in the string, and blur handles the final string. Process into the ideal format 111.11

Implementation: Process the main function val through seven regular rules to represent the input string

/^d*.?d{0, 2}$/ Verify whether val is in the format of ddd.dd, if it is, it will not be processed, otherwise it will be processed

/[^.0-9] / Process all non-digit and. characters in val

/(?:d*.d{0,2}|d )/ Process val into the correct format.

/^d $/ Processing when it is an integer

/^.d{0,2}$/ Processing when there are no digits before the decimal point

/^d . d{0,2}$/ Processing when the number of digits after the decimal point is between 0-2

/^0 [1-9]d*.?d{0,2}$/ before val Processing when there is 0

Test data:

fdfd100.12 122.121 12t12.57 12546 1245. 125.4 154.45.456 .126 005245.121 dfdffd and so on

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