<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<FORM METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="tt" value="123456">
<input type="button" value="check" onclick="check()">
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
function isAllDigits(argvalue) {
argvalue = argvalue.toString();
var validChars = "0123456789";
var startFrom = 0;
if (argvalue.substring(0, 2) == "0x") {
validChars = "0123456789abcdefABCDEF";
startFrom = 2;
} else if (argvalue.charAt(0) == "0") {
validChars = "01234567";
startFrom = 1;
} else if (argvalue.charAt(0) == "-") {
startFrom = 1;
} for (var n = startFrom; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
}
return true;
}function check(){
var form=document.forms[0];
if(!isAllDigits(form.tt.value)){
alert("您输入的不是数字!");
}else{
alert("您输入的是数字!");
}
}
//-->
</SCRIPT>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<FORM METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="tt" value="123456">
<input type="button" value="check" onclick="check()">
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
function isAllDigits(argvalue) {
argvalue = argvalue.toString();
var validChars = "0123456789";
var startFrom = 0;
if (argvalue.substring(0, 2) == "0x") {
validChars = "0123456789abcdefABCDEF";
startFrom = 2;
} else if (argvalue.charAt(0) == "0") {
validChars = "01234567";
startFrom = 1;
} else if (argvalue.charAt(0) == "-") {
startFrom = 1;
} for (var n = startFrom; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
}
return true;
}function check(){
var form=document.forms[0];
if(!isAllDigits(form.tt.value)){
alert("您输入的不是数字!");
}else{
alert("您输入的是数字!");
}
}
//-->
</SCRIPT>
</BODY>
</HTML>
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function Check(field)
{
if ( isNaN(field.value) )
{
alert("Not a number!");
field.focus();
}
}
</script>
<form name="test">
<input type="text" onBlur="Check(this)">
</form>