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<script language="JavaScript">
var stmp = "";
function nst(t){
   if(t.value==stmp) return;
   var ms = t.value.replace(/[^\d\.]/g,"").replace(/(\.\d{2}).+$/,"$1").replace(/^0+([1-9])/,"$1").replace(/^0+$/,"0");
   var txt = ms.split(".");
   while(/\d{4}(,|$)/.test(txt[0]))
     txt[0] = txt[0].replace(/(\d)(\d{3}(,|$))/,"$1,$2");
   t.value = stmp = txt[0]+(txt.length>1?"."+txt[1]:"");
   bbb.value = number2num1(ms-0);
}
function number2num1(strg){
   var number = Math.round(strg*100)/100;
   number = number.toString(10).split('.');
   var a = number[0];
   if (a.length > 12)
     return "数值超出范围！支持的最大数值为 999999999999.99";
   var e = "零壹贰叁肆伍陆柒捌玖";
   var num1 = "";
   var len = a.length-1;
   for (var i=0 ; i<=len; i++)
    num1 += e.charAt(parseInt(a.charAt(i))) + [["圆","万","亿"][Math.floor((len-i)/4)],"拾","佰","仟"][(len-i)%4];
   if(number.length==2 && number[1]!=""){
     var a = number[1];
     for (var i=0 ; i<a.length; i++)
      num1 += e.charAt(parseInt(a.charAt(i))) + ["角","分"][i]; 
   }
   num1 = num1.replace(/零佰|零拾|零仟|零角/g,"零");
   num1 = num1.replace(/零{2,}/g,"零");
   num1 = num1.replace(/零(?=圆|万|亿)/g,"");
   num1 = num1.replace(/亿万/,"亿");
   num1 = num1.replace(/^圆零?/,"");
   if(num1!="" && !/分$/.test(num1))
     num1 += "整";
   return num1;
}
</script>
小写金额：<input type="text" name="aaa" onkeyup="nst(this)"><br>
大写金额：<input type="text" name="bbb" size=80>