ASCII码值控制键盘只能输入某些字符或符号

通过判断ASCII值可限制一些字符和符号的输入，比如只能输入数字和“.”:

<asp:TextBox ID="TxtGuaranteeEndDate2" runat="server" Width="141px"
onkeypress="onlyNumericAndDot()" Style="ime-mode: disabled"></asp:TextBox>

//验证只能为数字和.
function onlyNumericAndDot()
 {
         if(window.event.keyCode != 46)
          {
                  if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57)) || (window.event.keyCode == 13) || (window.event.keyCode == 46)))
                  {
                       window.event.keyCode = 0 ;
                  }
          }
  }

并且要补上Style="ime-mode: disabled"，此属性是屏蔽输入法切换