export const getMbStringLength = str => {
  let totalLength = 0;
  const list = str.split('');
  for (let i = 0, len = list.length; i < len; i++) {
    const s = list[i];
    if (s.match(/[\u0000-\u00ff]/g)) {
      //半角
      totalLength += 1;
    } else if (s.match(/[\u4e00-\u9fa5]/g)) {
      //中文
      totalLength += 2;
    } else if (s.match(/[\uff00-\uffff]/g)) {
      //全角
      totalLength += 2;
    } else {
      // 其它按全角处理
      totalLength += 2;
    }
  }
  return totalLength;
};

export const splitMbString = (str, start = 0, end) => {
  let totalLength = 0;
  const list = str.split('');
  for (let i = 0, len = list.length; i < len; i++) {
    const s = list[i];
    if (s.match(/[\u0000-\u00ff]/g)) {
      //半角
      totalLength += 1;
    } else if (s.match(/[\u4e00-\u9fa5]/g)) {
      //中文
      totalLength += 2;
    } else if (s.match(/[\uff00-\uffff]/g)) {
      //全角
      totalLength += 2;
    } else {
      totalLength += 2;
    }

    if (totalLength >= end) {
      return [
        list.slice(start, i).join(''),
        list.slice(i, list.length).join(''),
      ];
    }
  }
};