<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <SCRIPT LANGUAGE="JavaScript"> function checknum(strValue,strlen) { var strValue;
if(isNaN(strValue) == true){
return false;
}else{
strValue = strValue.split("."); if ((strValue[0].split(" ")[0]=="")||(strValue[0]=="")) {
return false;
}else{ if ((strValue[0].substr(0,1) =="-")||(strValue[0].substr(0,1) =="+")) {
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<SCRIPT LANGUAGE="JavaScript">
function checknum(strValue,strlen)
{
var strValue;
if(isNaN(strValue) == true){
return false;
}else{
strValue = strValue.split(".");
if ((strValue[0].split(" ")[0]=="")||(strValue[0]==""))
{
return false;
}else{
if ((strValue[0].substr(0,1) =="-")||(strValue[0].substr(0,1) =="+"))
{
return false;
}else{
if (strValue[1]=="")
{
return false;
}else{
if (strValue[0].substr(0,1) == "0" && strValue[0].length > 1)
{
return false;
}
else
{
if (strValue[1].length > strlen)
{
return false;
}
else
{
return true;
}
}
}
}
}
}
}
function check()
{
if (checknum(document.form1.t1.value,2) == false)
{
alert("不满足条件");
}
else
{
alert("满足条件");
}
}
</SCRIPT>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<FORM METHOD=POST ACTION="" name="form1"><input type="text" name="t1">
<input type="button" name="bt1" onClick="check()">
</FORM>
</BODY>
</HTML>