export function byteLength(str:string) {
  let b = 0;
  if (str.length) {
    for (let i = 0; i < str.length; i++) {
      if (str.charCodeAt(i) > 255) {
        b += 2;
      } else {
        b++;
      }
    }
    return b;
  } else {
    return 0;
  }
}

export function sliceStr(str:string, length = 24) {
  let a = '';
  let b = '';
  for (let i = 0; i <= str.length; i++) {
    if (byteLength(str.slice(0, i)) >= length) {
      a = str.slice(0, i - 1);
      b = str.slice(i - 1);
      return [a, b];
    }
  }
  return [str.slice(0, str.length), str.slice(str.length)];
}

export function addNames(list = [], name:string, needSplit = false) {
  const str = list && list.reduce((result, item) => (result + `${result ? ',' : ''}` + item[name]), '');
  return str ? (needSplit ? `${str};` : str) : '';
}

export function isOrderAdd(id:string) {
  return id.includes('_');
}

export function handlePhone(str: string) {
  // @ts-ignore
  return str.match(/(\d{3})(\d{4})(\d{4})/)
    .slice(1)
    .reduce(function (value, item, index) {
      // 当index===1时，初始元素和当前元素累加并返回，value是初始值186，也是最终累加的返回值，item是当前索引下标是1的元素****。
      return index === 1 ? value + '****' : value + item;
    });
}