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Editor to share with you how to convert JavaScript into numerical types, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Convert to a numeric type

(1), Number () can convert any value to a numeric value. If there is a character in the string that is not a numeric value, return NaN.

Such as:

Var num1 = Number ("10"); console.log (num1); / / 10var num2 = Number ('10adbdn'); console.log (num2); / / NaNvar num3 = Number ("10.78"); console.log (num3); / / 10.78var num4 = Number (' 10.65dd'); console.log (num4); / / NaNvar num5 = Number ("A10"); console.log (num5); / / NaN

(2), parseInt () to integer

Such as:

Var num1 = parseInt ("10"); console.log (num1); / / 10var num2 = parseInt ('10adbdn'); console.log (num2); / / 10var num3 = parseInt ("10.78"); console.log (num3); / / 10var num4 = parseInt (' 10.65dd'); console.log (num4); / / 10var num5 = parseInt ("A10"); console.log (num5); / / NaN

(3), parseFloat () to decimal

Such as:

Var num1 = parseFloat ("10"); console.log (num1); / / 10var num2 = parseFloat ('10adbdn'); console.log (num2); / / 10var num3 = parseFloat ("10.78"); console.log (num3); / / 10var num4 = parseFloat (' 10.65dd'); console.log (num4); / / 10var num5 = parseFloat ("A10"); console.log (num5)

The difference among (4), Number (), parseInt () and parseFloat ()

Number () is stricter than parseInt () and parseFloat ().

ParseInt () is similar to parseFloat (), and parseFloat parses the first one. I met the second one. Or a non-digital end.

What can JavaScript do? It can make web pages interactive, such as responding to user clicks and providing users with a better experience. two。 You can process forms, verify user input, and provide timely feedback to save users time. 3. The page can be created dynamically according to the user's operation. 4 using JavaScript, you can set up some temporary information that cookie stores on the browser.

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