truncate method

String truncate(int maxLength, [ String ellipsis = '...' ])

截取字符串到指定长度，如果超长则添加省略号

Implementation

String truncate(int maxLength, [String ellipsis = '...']) {
  if (length <= maxLength) return this;
  return substring(0, maxLength - ellipsis.length) + ellipsis;
}