/**
 * 统计字数，英文算1个，中文算2个
 * @param  {string} str [description]
 * @return {number}     [description]
 */
export const getStrLength = (str: string): number => {
  if (typeof str !== "string") {
    return 0;
  }
  let length: number = 0;
  for (let i = 0; i < str.length; i++) {
    if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128) {
      length++;
    } else {
      length += 2;
    }
  }
  return length;
};