请问javascript如何把30000000.1286转换成30,000,000.13

Question

function formatNum(num) //将数字转换成三位逗号分隔的样式
{
  if(!/^(\+|-)?(\d+)(\.\d+)?$/.test(num)){alert("wrong!"); return num;}
  var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3;
  var re = new RegExp().compile("(\\d)(\\d{3})(,|$)");
  while(re.test(b)) b = b.replace(re, "$1,$2$3");
  return a +""+ b +""+ c;
}
alert(formatNum(-12345678.123));
alert(formatNum("12345678.123"));
alert(formatNum("10000000000000000000000000000000000000000"));

Answer 1

alert(formatNum("1.00000000000000000000000000000000000000001"));

Answer 2

请问javascript如何把30000000.1286转换成30,000,000.13

Answer 3

function formatNum(num, digit) //将数字转换成三位逗号分隔的样式
{
  if(!/^(\+|-)?(\d+)(\.\d+)?$/.test(num)){alert("wrong!"); return num;}
  var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3;
  var re = new RegExp().compile("(\\d)(\\d{3})(,|$)");
  while(re.test(b)) b = b.replace(re, "$1,$2$3");
  if (c && digit && new RegExp("^.(\\d{"+ digit +"})(\\d)").test(c)){
  if (RegExp.$2>4) c = (parseFloat(RegExp.$1)+1)/Math.pow(10, digit);
  else c = "."+ RegExp.$1;}
  return a +""+ b +""+ (c+"").substr((c+"").indexOf("."));
}
alert(formatNum(-12345678.005, 2));
alert(formatNum("12345678.1256246", 6));
alert(formatNum("10000000000000000000000000000000000000000"));

Answer 4

<script language="vbscript">
function formatNum (str, n)
  formatNum = FormatNumber(str,n)
end function
</script>
<script>
alert(formatNum("12345678.1256246", 2))
</script>

Answer 5

function formatNum(num, digit) //将数字转换成三位逗号分隔的样式
{
if(!/^(\+|-)?(\d+)(\.\d+)?$/.test(num)){alert("wrong!"); return num;}
var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3;
var re = new RegExp().compile("(\\d)(\\d{3})(,|$)");
while(re.test(b)) b = b.replace(re, "$1,$2$3");
if (c && digit && new RegExp("^.(\\d{"+ digit +"})(\\d)").test(c)){
if (RegExp.$2>4) c = (parseFloat(RegExp.$1)+1)/Math.pow(10, digit);
else c = "."+ RegExp.$1;}
return a +""+ b +""+ (c+"").substr((c+"").indexOf("."));
}
//alert(formatNum(-12345678.005, 2));
//alert(formatNum("12345678.1256246", 6));
//alert(formatNum("10000000000000000000000000000000000000000"));

var mm=1;
function imgzoom(h)
{   
if (h==1)
{
mm+=0.2;
mm=formatNum(Math.min(2,mm),2);
document.all.imgjpg.style.zoom=mm;
window.htm_all.style.zoom=mm;
alert(mm*100+"%");
}
else if(h==2)
{
mm-=0.2;
mm =formatNum(Math.max(0.05, mm),2);
document.all.imgjpg.style.zoom=mm;
window.htm_all.style.zoom=mm;
alert(mm*100+"%");
//document.body.style.zoom=mm;
}
}
可是这样会报错

Answer 6

http://community.csdn.net/Expert/topic/3880/3880020.xml?temp=.8474542
关注这个问题。对了。楼上的哥们，是JAVA脚本