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JS verifies that the string is a numeric function

Source: Internet
Author: User
Keywords Web page production Ajax javascript
Tags ajax data entered the function information it is javascript string
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Web page effects Verify that the string is a numeric function
A lot of time we need to verify that the user entered the information is a pure number, now we have defined the number of letters 0-9, so that the user input data to compare, if it is OK.
*/

function Checkifnumber (str)
{
var letters = "1234567890";
var i;
var C;
for (i = 0; i < str.length i + +)
{
c = Str.charat (i);
if (Letters.indexof (c) < 0)
return false;
}
return true;
}
var tel = 123456;
if (Checkifnumber (tel))
{
Alert (' Digital verification passed ');
}
Else
{
Alert (' Www.jzread.com The information you have entered is not a number ');
}

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Related Keywords:
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