If fill in shows that accords with a requirement: fill in the correct;
If fill out is not in conformity with the requirements, the show: fill in error,

CodePudding user response:

Find dom elements, such as the input box to find the value value with regular judgment if (//. Enter your regular (there) test (value)) determine the tip can be

CodePudding user response:

According to the DOM event operation,
Use the jquery change a try,