code: function chalk(srcStr, color) {
        if (!has(colorList, color)) color = 'default';
        return colorList[color].replace(/%s/, srcStr);
      }
docs: [fn.chalk] 返回带颜色的字符串
  @param srcStr : string
  @param color  : 'grey'|'blue'|'cyan'|'green'|'magenta'|'red'|'yellow' [?]