数字用千分位表示

1. C#方法

string Fmt2 = "#,###.00";
string Fmt0 = "#,###";
/// <summary>
/// 格式化數量
/// </summary>
private string FormatQty(string qty)
{
	// 數量為0
	if (qty.Equals("0"))
		return "0";

	double d = 0D;
	if (qty.IndexOf('.') > -1)
	{
		// 有小數
		if (double.TryParse(qty, out d))
			return d.ToString(Fmt2);
	}
	else
	{
		// 無小數
		if (double.TryParse(qty, out d))
			return d.ToString(Fmt0);
	}

	// reutrn string.Empty;
	return FormatNullOrEmpty(string.Empty);
}

2. JavaScript方法（来自网络）

function formatThousandStyle(number) {
   var num = number + "";
   num = num.replace(new RegExp(",","g"),"");
   // 正负号处理
   var symble = "";
   if(/^([-+]).*$/.test(num)) {
	   symble = num.replace(/^([-+]).*$/,"$1");
	   num = num.replace(/^([-+])(.*)$/,"$2");
   }

   if(/^[0-9]+(\.[0-9]+)?$/.test(num)) { 
				  
	   var num = num.replace(new RegExp("^[0]+","g"),"");
	   if(/^\./.test(num)) {
		   num = "0" + num;
	   }

	   var decimal = num.replace(/^[0-9]+(\.[0-9]+)?$/,"$1");
	   var integer= num.replace(/^([0-9]+)(\.[0-9]+)?$/,"$1");
	   var re=/(\d+)(\d{3})/;

	   while(re.test(integer)){
		   integer = integer.replace(re,"$1,$2");
	   }
	   return symble + integer + decimal;
   }
   else {
	   return number;
   }
}