function formatName(name) {
    let newStr;
    if (name.length === 2) {
    newStr = name.substr(0, 1) + '*';
    } else if (name.length > 2) {
      let char = '';
      for (let i = 0, len = name.length - 2; i < len; i++) {
        char += '*';
      }
      newStr = name.substr(0, 1) + char + name.substr(-1, 1);
    } else {
      newStr = name;
    }

    return newStr;
 }

原文链接：https://blog.csdn.net/weixin_42164539/article/details/99587819

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