Javascript validations

Hello there..

I have this, VB.Net code..
Can someone tell me, how can i do exact same thing in javascript?

Dim allowedChars As String = "0123456789$,"

If allowedChars.IndexOf(e.KeyChar) = -1 Then
' Invalid Character
e.Handled = True
End If

i meen, how to check if some char in textbox contains one of the ones in string "allowedChars"
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