JavaScript authentication is a digital

JavaScript restricts the input to only numbers, determines the value of the Event.keycode, and restricts it to numbers only, and if it is not a number, returns an error and, if it is a number, continues.

Let me show you how to verify that JavaScript is a number another way, by using the following function:

function Isnumber (onum)

{

if (!onum) return false;

var strp=/^\d+ (\.\d+)? $/;

if (!strp.test (Onum)) return false;

try{

if (parsefloat (onum)!=onum) return false;

}

catch (ex)

{

return false;

}

return true;

}

This JavaScript code is very concise, you can see. Http://map.sogou.com/poi/1_D1000058002509.htm

There is a more stupid method, you can also see, learn

Next time you put a regular verification number.

The simplest JavaScript validation is not a number code as follows:

Using the Sinan function, click here to see the isNaN function description

JavaScript authentication is a digital