How to use jquery to determine whether it is a number

How to use jquery to determine whether it is a number: first create a new file, use the input tag to create an input box; then use the button tag to create a button, and bind the onclick click event to the button button; finally pass [test()] The method uses regular expressions to determine whether the input content is a number.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, DELL G3 computer.

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##How to use jquery to determine whether it is a number:

1. Create a new html file, named test.html, to explain how to use jquery to determine whether it is a number.

2. In the test.html file, use the input tag to create an input box and set its id to

myinput, which is mainly used for the following The id gets the input object.

3. In the test.html file, use the button tag to create a button with the button name "Judge whether it is a number".

4. In the test.html file, bind the onclick event to the button button. When the button is clicked, execute the isnum() function.

5. In the js tag, create the

isnum() function. Within the function, obtain the input object through the id value of the input (myinput). Then use the val() method to obtain the input content, and write a regular expression to verify the number "/^[1-9][0-9] $/gi".

6. In the isnum() function, use the if statement and use the

test() method to use regular expressions to determine whether the input content is a number. , if it is a number, it will prompt "Input is correct", otherwise, it will prompt "Please enter a number".

7. Open the test.html file in the browser, enter the content in the text box, click the button to see the effect.

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