js：最多保留2位小数、价格格式化

export function priceFormat(num) {
  if (Object.prototype.toString.call(num) == "[object Number]") {
      return parseFloat(num.toFixed(2));
  } else if (Object.prototype.toString.call(num) == "[object String]") {
      return parseFloat(parseFloat(num).toFixed(2));
  } else {
      return num;
  }
}