<script>
function regInput(reg){
var srcElem = event.srcElement
var oSel = document.selection.createRange()
var srcRange = srcElem.createTextRange()
oSel.setEndPoint("StartToStart", srcRange)
var num = oSel.text + String.fromCharCode(event.keyCode) + srcRange.text.substr(oSel.text.length)
event.returnValue = reg.test(num)
}
</script>


<input type="text" name="T2" onKeyPress="regInput(/^[\w]*$/)" >



其实就是防止登陆的时候输入一些非法字符,但实际测试的时候我发现只要输入中文后,就不能继续输入数字或英文了,但是只输入英文也可以输入数字


如: 输入 小白 再按 222 就输不进去; 输入 xiaobai 还可以跟任何数字

思路就是，首先判断前两位输入的是中文还是英文来进行限制是否允许输入数字

既然这样,为什么不在提交之后进行非法验证过滤捏?
给你个数据库防注入的程序吧 ... 看看能吧能用上...
Function Checkstr(Str)
If Isnull(Str) Then
CheckStr = ""
Exit Function
End If
Str = Replace(Str,Chr(0),"", 1, -1, 1)
Str = Replace(Str, """", "&quot;", 1, -1, 1)
Str = Replace(Str,"<","&lt;", 1, -1, 1)
Str = Replace(Str,">","&gt;", 1, -1, 1)
Str = Replace(Str, "script", "&#115;cript", 1, -1, 0)
Str = Replace(Str, "SCRIPT", "&#083;CRIPT", 1, -1, 0)
Str = Replace(Str, "Script", "&#083;cript", 1, -1, 0)
Str = Replace(Str, "script", "&#083;cript", 1, -1, 1)
Str = Replace(Str, "object", "&#111;bject", 1, -1, 0)
Str = Replace(Str, "OBJECT", "&#079;BJECT", 1, -1, 0)
Str = Replace(Str, "Object", "&#079;bject", 1, -1, 0)
Str = Replace(Str, "object", "&#079;bject", 1, -1, 1)
Str = Replace(Str, "applet", "&#097;pplet", 1, -1, 0)
Str = Replace(Str, "APPLET", "&#065;PPLET", 1, -1, 0)
Str = Replace(Str, "Applet", "&#065;pplet", 1, -1, 0)
Str = Replace(Str, "applet", "&#065;pplet", 1, -1, 1)
Str = Replace(Str, "[", "&#091;")
Str = Replace(Str, "]", "&#093;")
Str = Replace(Str, """", "", 1, -1, 1)
Str = Replace(Str, "=", "&#061;", 1, -1, 1)
Str = Replace(Str, "'", "''", 1, -1, 1)
Str = Replace(Str, "select", "sel&#101;ct", 1, -1, 1)
Str = Replace(Str, "execute", "&#101xecute", 1, -1, 1)
Str = Replace(Str, "exec", "&#101xec", 1, -1, 1)
Str = Replace(Str, "join", "jo&#105;n", 1, -1, 1)
Str = Replace(Str, "union", "un&#105;on", 1, -1, 1)
Str = Replace(Str, "where", "wh&#101;re", 1, -1, 1)
Str = Replace(Str, "insert", "ins&#101;rt", 1, -1, 1)
Str = Replace(Str, "delete", "del&#101;te", 1, -1, 1)
Str = Replace(Str, "update", "up&#100;ate", 1, -1, 1)
Str = Replace(Str, "like", "lik&#101;", 1, -1, 1)
Str = Replace(Str, "drop", "dro&#112;", 1, -1, 1)
Str = Replace(Str, "create", "cr&#101;ate", 1, -1, 1)
Str = Replace(Str, "rename", "ren&#097;me", 1, -1, 1)
Str = Replace(Str, "count", "co&#117;nt", 1, -1, 1)
Str = Replace(Str, "chr", "c&#104;r", 1, -1, 1)
Str = Replace(Str, "mid", "m&#105;d", 1, -1, 1)
Str = Replace(Str, "truncate", "trunc&#097;te", 1, -1, 1)
Str = Replace(Str, "nchar", "nch&#097;r", 1, -1, 1)
Str = Replace(Str, "char", "ch&#097;r", 1, -1, 1)
Str = Replace(Str, "alter", "alt&#101;r", 1, -1, 1)
Str = Replace(Str, "cast", "ca&#115;t", 1, -1, 1)
Str = Replace(Str, "exists", "e&#120;ists", 1, -1, 1)
Str = Replace(Str,Chr(13),"<br>", 1, -1, 1)
CheckStr = Replace(Str,"'","''", 1, -1, 1)
End Function