<mce:script language="javascript"><!--
function formatNum(num,n)
{//参数说明:num 要格式化的数字 n 保留小数位
num = String(num.toFixed(n));
var re = /(-?/d+)(/d{3})/;
while(re.test(num)) num = num.replace(re,"$1,$2")
return num;
}
alert(formatNum(1234005651.789,2));
// --></mce:script>