jquery realizes that the specified text box can only enter numbers

This time I will bring you jquery to realize that only numbers can be entered into the specified text box. jquery can only input numbers into the specified text box.What are the precautions?The following is a practical case, let's take a look.

First, let’s start with a jQuery code that stipulates that the text box can only enter numbers including decimals:

2. How jQuery stipulates that the text box can only enter integers:
Sometimes the content of the text box can only be numbers, and it can only be integers. For example, for age, you cannot fill in 20.8 years old. The following is an example of how to implement this function through code. I hope it can help those who need it. Friends bring help, the code is as follows:

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