<html>
<SCRIPT LANGUAGE="JavaScript">
<!--
function formatNum(obj)
{
obj.value=obj.value.replace(",","");
if(isNaN(obj.value))
{
alert('请填写数字！');
}
else
{
if(obj.value.split(".").length>1)//带小数点的
{
var n1=obj.value.split(".")[0];
var n2=obj.value.split(".")[1].substring(0,2);
if(n1>3)
{
var tempStr="";
var arr=new Array();
var j=0;
for(i=0;i<n1.length;i+=3)
{
arr[j] = n1.substring(n1.length-(i+3),n1.length-i);j++
}
tempStr = arr.reverse();
obj.value=tempStr+"."+n2;
}
}
else//不带小数点的
{
var n1=obj.value;
if(n1>3)
{
var tempStr="";
var arr=new Array();
var j=0;
for(i=0;i<n1.length;i+=3)
{
arr[j] = n1.substring(n1.length-(i+3),n1.length-i);j++
}
tempStr = arr.reverse();
obj.value=tempStr;
}
}
}
}
//-->
</SCRIPT>
<FORM name=form1 METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="txt1" onblur="formatNum(this);">
</FORM>
</body>
</html>