ascii是什么意思？

问题描述

Dim keyascii As String = e.KeyChar
      Dim chback As String
      chback = Asc(e.KeyChar)
      If chback = 8 Or keyascii >= "0" And keyascii <= "9" Or keyascii = "." Then
          e.Handled = False
      Else
          e.Handled = True
      End If

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