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>

js代码

 1 //验证只能为数字和.
 2 function onlyNumericAndDot()
 3  {
 4          if(window.event.keyCode != 46)
 5           {
 6                   if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57)) || (window.event.keyCode == 13) || (window.event.keyCode == 46)))
 7                   {
 8                        window.event.keyCode = 0 ;
 9                   }
10           }
11   }

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