What do you need to check for text box input on a web page?

For ordinary text input boxes. Usually check the following points: 1, enter Chinese and English spaces 2, if necessary, do not enter any characters 3, enter extra-long characters 4, enter spaces between strings 5, enter leading and trailing spaces 6, enter full-width/half-width special characters (especially single quotation marks) 7, enter html format language 8, and enter special strings NULL, null,&; Escape characters for spaces. 9: Enter normal character string 10: Enter full-width and half-width spaces 1 1: Enter full-width and half-width English characters 12: Enter full-width and half-width numbers 13: Enter Chinese characters (default full-width)/kloc-0. B> Hello & lt/b & gt；; , alert("hello ") value input box of expense category: 1, enter English space 2, enter Chinese space 3, and the input characters include A~Z or a~z or ~! @#$%^&； *()_+|{}[]:; '"/? & lt& gt4: Enter an integer with the first digit of 0.5, an integer with the end of 0.6, a positive value of 7, a negative value of 8, 0.9, a decimal 10, a decimal with the end of 0. 1 1, and multiple decimal points 12. (x-y) Effective value 14: the number entered has only one decimal point, to the right of the decimal point >; Effective value of y 15: the number entered has only one decimal point, and the number of decimal places is less than.