MS 为 jquery 编写了一个不错的插件。如果您要进行本地化，它尤其有用。试试看：

http://weblogs.asp.net/scottgu/archive/2010/06/10/jquery-globalization-plugin-from-microsoft.aspx

我不确定这是否可以在 jquery 之外使用...

我可能在这里剧透了，但没关系。这是我在某个时候发现的一个函数，从那时起我就一直在重复使用。我实际上并没有花心思去研究它到底是干什么的，但它相当有用：

function FormatMoneyAmount(starting_string, ending_string) {
  //check validity of input (true = invalid, false = valid)
  var valid_exp = new RegExp ('[^0-9,.$]', 'gi');
  input_invalid = (typeof(ending_string) == 'undefined' && valid_exp.test(starting_string));

  //check if more than 2 digits follow decimal or no decimal
  decimal_invalid = typeof(ending_string) == 'undefined' && (starting_string.indexOf('.') > -1) && ((starting_string.length - starting_string.indexOf('.')) > 3);

  if (input_invalid || decimal_invalid) {
    ending_string = starting_string;
  } else {
    //remove commas, dollar signs
    var replace_exp = new RegExp ('[,$]', 'gi');
    starting_string = starting_string.replace(replace_exp, '');

    //remove decimal if ending string not set, save for adding on later
    var decimal_substring = '';
    if (typeof(ending_string) == 'undefined' && starting_string.indexOf('.') > -1) {
      decimal_substring = starting_string.substring(starting_string.indexOf('.'), starting_string.length);
      remaining_string = starting_string.substring(0,starting_string.indexOf('.'));
    } else {
      remaining_string = starting_string;
    }

    //if string is already 3 characters or less, do nothing
    if (remaining_string.length > 3) {
      //separate last 3 characters of string from rest of string
      var final_three = remaining_string.substring(remaining_string.length - 3, remaining_string.length);
      remaining_string = remaining_string.substring(0, remaining_string.length - 3);

      //if not first group of 3, add new group before old group with comma, else set to new group
      ending_string = (typeof(ending_string) == 'undefined') ? final_three + ((typeof(decimal_substring) == 'undefined') ? '' : decimal_substring) : final_three + ',' + ending_string;

      //call function again if more than 3 digits remaining to process, else add to end string
      if (remaining_string.length > 3) {
        ending_string = FormatMoneyAmount(remaining_string, ending_string);
      } else {
        ending_string = remaining_string + ',' + ending_string;
      }
    } else {
      ending_string = (typeof(ending_string) == 'undefined') ? remaining_string : remaining_string + ',' + ending_string + ((typeof(decimal_substring) == 'undefined') ? '' : decimal_substring);
    }
  }
  return ending_string;
}

首先要检查字符串的格式，因为根据结果，您将有两个代码路径：

if (typeof num = "string" && num.slice(0,1) == "(" && num.slice(-1) == ")") {
    // String is in the format (x), so we just need to return that number
    return num.slice(1,-1) + " units left";
}

下一部分是检查数字是否小于 1，表示它是美分而不是整数美元。如果小于 1，则将其乘以 100 将得到您想要的美分数：

if (+num < 1)
    // 0.0580 * 100 = 5.8
    return (num * 100) + " cents";
else
    return +num + "$";